I dunno, lol. I personally am no fan of affiliates (and the associated 'web rings', 'topsites' and all those kinda stuff), mainly because they don't seem to work. But now that I can actually track properly what sites are giving us traffic, I'm willing to try it again.
Just a few conditions though: FF-related sites only (no Pokemon online or whatever), no shiny or distractive buttons / images (none at all, actually, just text links on the frontpage), and the counter-link should only be to the frontpage, not the forums, imho.