This is a discussion on New Ad Layout, including referrals within the Ad Networks forums, part of the Monetizing category; I'm going to give referral units a try... I was previously running a Google image ad to the right of ...
Not a bad thought if you get many firefox or google pack conversions.
I've never tried referral units before, so I really have no idea if they'll work or not. I'm almost positive the image ad that I was using before wasn't doing me any good, except by calling attention to the text links.
I figure it's worth a shot. I'll leave it for a week and then decide for sure.