If you want to follow-up with affiliates, you can
create an affiliate sign-up page and include the
link in your CB Marketplace description. You can
set up this special page and ask affiliates to
opt-in to an exclusive affiliate notification
list. Then ask for their Name, Email and Clickbank
ID.

Easy Click Mate is also a great option. Plus, you
can include affiliate tools in there and
affiliates can also promote multiple products of
yours from one area. It's a nifty system.

Another way is to search for their affiliate ids
using various methods and then contact them
personally. You can just contact your top
affiliates.

Fabian