If you have an affiliate program...

A really good idea is whenever one of your affliates make a sale, email them. I'm in several affiliate programs that do this and I end up selling them more. It's encouraging to get an email when you make a sale. It lets me know that the program works. And I go out of my way to sell a program that I know works.

If the only way I know I've made a sell is when I get a check months later I'm not as likely to sell that program. Especially if I have to do a search on google to figure out who the check is from. I don't know how many times I've gotten checks from some vague company and had to do a search on that name to even figure out what program it is.

So let your affiliates know right away that they have made a sale and what program it's from. If something sells then they'll start selling more of that.