[fel64]

> how else do you integrate a forum in a site??

Preferably not with iframes. iframes are really nasty, because you can never access the url of anything you navigate to and instead of the full browsing window you have just that frame.

It really depends on the kind of integration you want. If you want visual integration, just make it look the same or use some of the methods other dudes have used here (see Chris’ links).