For those of you promoting software products (registry cleaners, driver updaters, disk defrag, PC optimizers/speed up your PC, backup and antivirus)...

What do you look for in a software merchant (out of the affiliate program and on the merchant website itself, or product options)?

How can a software advertiser make your life easier, help you convert better, or offer to you so you can be a successful affiliate?

Is there anything unique to software promotions that stands out to affiliates in this niche?