Suggestions  - 
Game suggestions here!
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Lords of Waterdeep - a surprisingly good euro-style, worker placement game from Wizards of the Coast. This one really came out of left field and turned out to be quite fun.
Lords of Waterdeep is an excellent choice. A solid Euro-game that scales well from two to five players.

Review here: http://rlyehreviews.blogspot.co.uk/2012/08/wizards-go-euro.html

My suggestion would be Seven Wonders. A civilisation game themed around the building the Ancient Wonders of the World, using cards and simultaneous play with hands moving from one player to the next between plays. Can played in an hour.

Review here: http://rlyehreviews.blogspot.co.uk/2011/08/7-wonders.html 
Here is a couple:

Forbidden Island - Another cooperative game by Matt Leacock (designer of Pandemic) with a different sort of feel. You are one of four adventurers trying to retrieve relics from an island before it sinks into the sea. Awesome game with fantastic components that you can pick up for under $20.

Kill Doctor Lucky - Doctor Lucky owns a big mansion and has slighted you in some mediocre or horrible way. It doesn't really matter which, because you want him dead. The only problem is that everyone else wants him dead too and you're all chasing him around his mansion trying to kill him with a killing joke, bad cream, a tight hat and a small cannon without being witnessed by anyone else. Think of it as Clue in reverse.

The Resistance - A great social deduction and interaction game where there are a couple of spys at the table who know who each other is and a bunch of rebel fighters trying to bring down The Man. Can the Resistance have three successful missions before the spies thwart them? Great game.

Snow Tails - A game of dog sled racing in the frozen north.

Zooloretto - Think of it as zoo tycoon, the board game.
Pirate Dice: Voyage on the Rolling Seas - Pits pirate vs. pirate in an epic race to capture and escape with the lost treasure. Cleverly designed and consistently exciting. For 2-5 players.
I like the card game Fluxx.  It's a game for people with ADD because the rules can change from player to player as well as the goal for wining the game.
Star Fluxx was played in the most recent episode.
The Game of Thrones boardgame from Fantasy Flight (Not the card game) is a definite favourite in our boardgame rotation, Zombies!!! and Chaos in the Old World are also great.
I recently heard that to qualify for Tabletop, a game should
- be visually interesting
- fit into half an hour (including fast-forwards)
- play well with four players.

So, keeping in mind this and Wil's tastes according to his BGG entry I'd suggest:

Guillotine Taking the roles of headsmen during the French revolution, player try to re-arrange the line of convicts to score the most valuable heads.

Revolution! Another one from SJG. Brilliant secret bidding and majority game where players try to influence a village with the three "currencies" gold, blackmail and force.

Junta: Viva el Presidente The viciousness and backstabbing of the original Junta without all the clumsy rules from the 80ies.

Citadels A classic amongst games with a role-taking mechanism, players try to set up their buildings for victory points and surprise their opponents with the special effects of their current role.

Smash Up A light card game of classic creatures - Robots, Pirates, Aliens, Zombies et. al. - vying for the control of bases. Though it looks very simple from the outside, the creature sets have surprisingly individual game effects and strategies.

Power Grid My all time favourite, admittedly. It brilliantly combines auctioning, market and train mechanisms as the players, taking the roles of energy suppliers, have to bid for power plants, buy the necessary fuels and then expand their connection of cities they want to provide with electricity.
I second Power Grid. The auctioning would be fun to see since Wil always has great guests on with differing personalities.

Dominion would be a nice game too. Quick to play, easy to pick up on for newcomers. I don't know if Wil likes it though. 
How could I forget that Tabletop needs to feature at least one narrative/roleplaying game to follow up Fiasco? Admittedly, there aren't many games out there that are as rules light and focused on the story as Fiasco, but these might fit the bill:

Cosmic Patrol Pulp Science Fiction without a central narrator/gamemaster, that provides plenty of inspiration through tags and cues.

Inspectres Let's join in a ghost hunting franchise and kick some supernatural buttocks.This one has a guiding narrator though, and all participants need to be able to improvise heavily since the story builds up on everyone's impromptu ideas instead of a prepared plot.

Umläut, Game of Metal Very specific theme with different rock bands struggling on the road to stardom, but also very narrative with only a little element of chance based on card draws.

Kobolds Ate My Baby As we all know, kobolds are cannon fodder for adventuring parties, and here you play the unfortunate Kobolds. Sudden and hilarious mishaps are guaranteed. All Hail King Torg!
I'm waiting for the inevitable Cards against Humanity episode. I used to see Wil posting pics of the game when I was on Twitter
Enchanted Forest! Not a very interesting game but I have fond memories of playing it at school. Come to think of it, I'm gonna buy it now.

Anything by FFG - Twilight Imperium is wonderful, but it would be a marathon game.
Mr. Jack.  I think they could have fun role playing the characters, and I think it would film well. 
A second one, maybe for another minigame episode - "Pirates of the Caribbean Pirates Dice: A Game of High Seas Deception", more commonly known as liars dice.  
My friends and I usually play Galaxy Trucker when we meet up. I think it would translate brilliantly into the show's format.
One of the last table top games I have played and probably the most fun I have had in a long time is Robo Rally
If you are going to branch into RPGs then i wouldn't mind a Vampire:The Masquerade game. It's very easy to set up and play, plus who doesn't want to play as a badarse Vampire!  
If it was to be an RPG, it should be something Lovecraftian!
Cosmic Encounter could be awesome, particularly if you throw in some of the expansions
+Richard Doyle Mr. Jack is for two players only, as far as I know.

+Pookie UK For something lovecraftian, I'd almost suggest Pokethulhu - if it weren't out of print.
I think Niagara would be a blast. Paddle your canoe down the river to collect gems, but the weather can change how fast the river flows, and if players aren't careful, they'll go over the falls!
Dungeonquest! Been a favourite of mine since the old GW release
I second Kill Dr. Lucky.  And Forbidden Island, though it may play too similar to Pandemic to be interesting.

I'd also love to see:

Ascension - A deckbuilding game with very solid mechanics it keeps coming back again and again as a favorite.  Easy to catch on, hard to master. http://www.boardgamegeek.com/boardgame/69789/ascension-chronicle-of-the-godslayer

Space Alert - A chaotic timed ten minute game where you act first, and figure out what happened afterward.  Did the crew get eaten by the giant Space Octopus?  Did the green dude remember to refill the reactors BEFORE the lasers were fired?  Or were we all frantically pushing buttons and cursing his name?  Would fit well in the 30 minute time span. http://www.boardgamegeek.com/boardgame/38453/space-alert

Escape: the Curse  of the Temple - By Queen Games, another fast paced one, began and ended in ten minutes.  A cooperative game where you all escape the collapsing temple, or...well...erhm.  There is no turn order, and lots of chaos.  http://www.boardgamegeek.com/boardgame/113294/escape-the-curse-of-the-temple

Kingdom Builder - Also by Queen Games, it's a simple placement game with some mechanics to liven things up.  Also, the goals are randomized, so you get to work toward something new every time.  http://www.boardgamegeek.com/boardgame/107529/kingdom-builder
Chrononauts would be a really good game to try!  Each person is a time-traveler trying to change the timeline to get back to their home, and games can be really fun!  There are two versions and some expansions, which can all combine to form one super game called UberChrononauts.
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