The UT3 mods for the PS3 have been pretty cool so far. I haven't been interested in new maps/mods, etc. since Dark Forces and the Aliens Total Conversion mod for Doom.
The big problem right now however, is that the game doesn't automatically download new maps and mods, so now when you go to play a lot of online games, you can't connect to the games without having the right mods downloaded first. This needs to be fixed, stat.