What clan is Veremouth in?  One day me and Fatballs were in the vctf server just talking about how we'd never seen someone hitscan so well w/ such a bad ping.  I'm not pointing a finger exactly, just wondering if it's him you're talking about. 

Anyway, I suggest you invite people to talk on Ventrilo (for friendly talk) or something if you think they hack.  It might freak them out, especially if you compliment them.  I refuse to ignore hacking though.