www.prizefight.co.uk Play CSS, BF2, HL2 Deathmatch, Quake 4 for cash :P
Give me your email address, and I will send you an email which gives you £5 free promotional money (not real) but if you use that money to play games, and win. You will recieve 'Real' cash back which you can carry out via Paypal. If you run out of promotional money to play with, just invite more friends and you will get £5 promo each person you get to sign up.
PS: I've made around £16 from these guys in 2 days