I read that you can only display 3 separate ads on a single page. I visited several sites that have 4+ ad spaces displayed. Is it against TOS of google? How many ad per page do you use!?
Well ordinarily I would tell you go to closely read the Program Policies again, but given that the Adsense site is down at the moment, that would be kind of silly of me As per the TOS, you can have the following per single page: - 3 ad units (any shape & size) - 1 ad link unit (horizontal or vertical) - 2 search boxes - 4 referral buttons. If a site has 4+ ad spaces (not links, referral buttons, search boxes, etc) being displayed, either A) they are trying to be clever and hack Adsense, and are violating the TOS and will soon be caught, or B) they are a premium publisher or have a special deal with Google in order to display special premium ad formats or presentations on their page. Hope this helps!
Heh, well, for every 'right' way to do something, there's a lot of 'wrong' ways to do it, so, frames/iframes would be one of those, yes...