There's two for registered members: the top right and the little strip in between posts, like in this thread. There's three for guests I believe, but that's really not why you should be here. You should be here to learn or teach, not make money posting!
Is this a revenue-sharing question? I'd rather get less revenue from the threads I START and have more discreet ads. Except of course that Dominic gets all the revenue for the Homeless Charity, but I gather they're not earning terribly much.
Hey.. Don't kill me I jusk ask. After I was reading some complains about DP revenue (I mean something like : DP killed my CTR) I wondering how to fix that and only thing that came into my mind was - more ad units - P.S. was to get your attention.
Keep in mind that it is a Webmaster's forum and webmaster are (mostly) ad blind they wont click on ads even if there are 3 ad units. On the other hand, more ad units means more impressions so that would kill your CTR even more....
Very Good point, but keep in mind this. Before adsense I never click on ads. After that I search for information about x or about y and if i found that information on a good site or that problem was explained very good, I helped that webmaster....