CombatMaps - The Infiltration Source

Whenever I decide to make a map for a new game (Infiltration, Tactical Ops, Deus Ex, whatever) the first thing I do (after installing the game) is check out the competition. I don't like making a map that's similar to an existing work, so I'll download several custom maps and try them out. It's also exhilarating to find kick-ass custom maps that rival the stock maps, as was the case with EAS-INF-LondonCity.

Here are a couple of sites dedicated to Infiltration maps:

CombatMaps

RealMaps

While you're there, you may as well download the TBT Desert Storm mappack, since my INF map will be using their textures. :)