my number one extension on Chrome. Couldn't live without it (well i could, but that would just make it a little more annoying :-) but the kicker is that it is just simple,well done and not bloated. a Gem.
JoliCloud - if you don't have it, get it and connect all of your Cloud storages to create one BIG one - I've just added #Box on Drive by #Jolicloud. Get extra free storage here http://joli.io/r/WdibRO