*must... restrain... Fist.. of Death....*
Seriously if you want to use an admin mod, don't. Most servers already use them, so there's no reason to add more to the lot. To my thinking, we need LESS admin mods servers and more non-admin mod servers. Rcon is easy to learn (it's in every Quake3 engine game after all) and it's adequate for maintaining a server without resorting to abusive or cheat-like "powers" that are so common to these mods.
Anyway, if you still want to waste your time, the usual mod websites have them all. If you want to know some mod websites, there is pcgamemods.com, massassi.net, lucasfiles.com (part of this network), etc.
Just be careful out there, a lot of admins abuse these mods, and that makes people here (like me) mad, so let's not start a flame war about it if we can...
If you want to responsibly admin a server, there is a Dedicated Server Forum (
http://www.lucasforums.com/forumdisplay.php?s=&forumid=334you) can view for info and tips. Remember that you don't need an admin mod to be an admin...