Hi Saul,
Sure there are lots of directories, but many of them are not kept up to date.
A couple of the best are
Associate Programs Affiliate Directory
and AffiliateTip
Affiliate Tip Affiliate Program Directory
The 5 Star directory is much smaller because I only list 5 Star programs I represent which are
guaranteed to be honest, pay on time and have high commissions.
5 Star Affiliate Directory
One of the best and easiest ways to find programs though is through a network. Just like you find info products at Clickbank, you can join ShareResults, CJ or Shareasale to easily search for the type of products you want to promote. Most networks have a way to see EPC which tells you if other affiliates are actually making any money with the program.
Hope this helps and best of luck!