I examined 6 of the latest hacks and here are the results:

ADE-UT2K3-Radar
BB-Bot_v100
BB-Bot_v102

All three of these hacks are unknown backdoor Trojans that allow their master to gain control over your system. They work by contacting their master via ICQ and then connecting in the background to an irc server where they can take orders. If you have installed one of these hacks you have basically handed the keys to your PC to the author of the "cheat".

Onxy-Radar
Onxy-Zoom Hack

These two hacks will grab your CD key and send them to a PHP script. If you run either of these two programs, your CD key has been compromised.

UT2K3_Radar by [Elf]Retard

This is a variant of the Helios Trojan and I didn't even brother running it. The Helios is similar to the Trojan above.