The way we built up our program was really by talking to affiliates to see what it was they wanted.
More banners with variety in size.
Keyword files for CPC ads.
HTML Website Templates.
Active affiliate managment.
Looking at your site it looks like you have everything covered. The biggest thing is getting your affs to understand the product so they can get it to perform. If they think it's a great product then selling will come easy. If not then they will struggle.
I guess the fact that our program is totally free is a draw too.
