Affiliate Management Software Evaluation

After listening to Mr Dustin Andaya ( speak on his experience using affiliate marketing to increase their online sales, I started an evaluation process for the right software to use.

It is here that I ask for your help. Do you have experience in running or managing affiliate networks? What features would you consider most important? Which features would you consider least important?

Are you an evangelist for an affiliate management software? Let me know so we can test it out.

Many thanks for your advise.