To clear everything up, I use 4e, but I'll right in (hopefully) system-neutral terms.
When I plan an encounter, I give the monsters a 'trick', like for instance letting warforged ride motorcycles, and I attach some cool stuff to the motorcycles so that PCs can learn to ride and use then.
To make things more interesting in the above encounter against biker warforged, I dotted the map with LOTS of rocks so that everyone has to maneuver a lot. Snipers are also a neat addition here, since anyone that gets a good view of the battlefield from a high vantage point is going to be in range of the snipers.
To summarize, then, I make good use of terrain, mounts, NPC complications, traps, and interesting monsters to make my encounters come off as more cinematic, which is the goal with Eberron combats.