You can see how I run the member banner ads and a google ad, here.
I use a simple php script that manages these ads. I edit the code to add or delete the ads. The ads are also randomized every page view. I've managed to get a field in the right column in XF and display the ads, but can't get them to rotate or show up on every forum page, only the landing/home page.
I sure like a lot of things about XF, but I must say, coming from the vB world, it sure lacks documentation!