I'm really bummed.  I had always thought of doing a website about dating and cheaters (I honestly did), but somebody (actually, a few people) beat me to the punch.  Don't Date Him Girl is a site where you can search for cheating men or warn other women about men who have cheated on you. 

Not to worry guys, here are a few sites for both men and women:  Dating Psychos, True Dater, Cheaters Online Database.  Let's face it, women cheat too. 

I hope none of your mug shots are posted!