I've been looking into which companies I may want to join as an affiliate. I think of companies I purchase products from and look into how they fit my websites. Then look into how their program works.

In the old forum at Site-Recovery and previous incarnation of this one, members discussed sites like Commission Junction. I took a quick look at them the other day. Anyone with them for a long time, please note pros and cons of using them?

Any other tips to share?