I use Avast! I'm happy with it. Tho the "Avast! Virus database has been updated!" that comes every other time I start my PC is quite annoying. Otherwise I see nothing bad about Avast!
Ohai thurr... I see you do flash games of the week and shit, so may I nominate this bit of awesome for the next one? http://en.wikipedia.org/wiki/N_%28video_game%29
I was planning on reviewing it myself, but due to recent events in my personal life, I will not be able to.