So, who here plays UT3 (or did) and is keeping their eyes on mods (or even mutators) for it?
There are three I can think of that I like:
The Haunted:
This is fun to play, but not that original.. It's basically a zombie-survival game. I think it's most fun playing multiplayer. Battle-mode is fun!

Battle-mode is zombie-vs-human.
Planetstorm:
I haven't ever played games like Battlefield, but if I'm correct, this mod has ground maps that are huge, on a similar scale to Battlefield! Then there are space maps, where you can battle it out ship-to-ship, or take a fighter and board and sabotage enemy ships. Really fun imo.
Project Stealth:
This hasn't been released yet, but I'm looking forward to it a lot!