I just join some affiliates programs periodically and see which ones work best for my blog audience and my own profit of course
![Smile](images/smilies/smile.gif)
Some affiliates programs are not worth it at all, so you must be picky and analyze your results monthly.
If anyone's interested there's a new good program from a new SEO tool called WebMeUp (info is here
http://webmeup.com/partners/affiliate-program.html).
I don't know why but I manage to generate the majority of my income through this program. Maybe it's because the tool is just great and is perfect for SEO.