So far the only busted cheater I know of in Quake Live is Yuka. However there are a number of suspicious players still out there. Here is the list of players I know are suspected of cheating by some (including me).

red_sprite http://www.quakelive.com/#profile/summary/red_sprite
tiest0s http://www.quakelive.com/#profile/summary/tiest0s
Xenonjji http://www.quakelive.com/#profile/summary/xenonjji

If you have any reliable information that an alias of some pro is on the list then I will remove it. Also feel free to make your own list of suspected players.