Welcome to WebmasterWorld Guest from 126.96.36.199
I am considering it, but would have to buy and install and upgrade, etc.
From what I've seen though, the best forums are those like this one (webmasterworld) that are stand-alone. Forums that are linked to existing content based sites don't seem to have that much traffic.
I was planning on putting my adsense on the new forum for additional income.
It seems more work and upkeep than it's worth though no?
As for AdSense for forums, short answer: it isn't ideally suited. This thread [webmasterworld.com] should sort you out though.