According to Google, they make it sound like you have to be very careful when putting other ads on the site, they say they cant appear to be google ads, so I was worried about using anything except google. Kind of funny last night though, my daughter logged into her myspace page, and at the top was a text based banner that said google in the corner, then crammed right on top of it was a annoying giant flashing ad, I thought, man, I hope google doesnt have annoying ads like that on my site, I didn't check, but I dont think it was a google ad, but the layout, made it look like it was.