I just wanted to recommend Aweber as a MUST for any affiliate to control emails and signups to newsletters etc...
This software does everything and is probably the best tool I have used for all my sites.
Soon, I will look into exploring all their sales tools so that I can use it to its full potential.
I just signed up to be an affiliate with them as well and will soon start promoting it as an affiliate tool at
www.pokeraffiliating.com.
If anyone has any tips on using the backend besides the normal autoresponder/newsletter features, please post them here.
I included my aff link in my sig - so if anyone signs up via my link, please PM me and we can work something out!
Good luck.