I have a spread sheet with sponsor name and the date for the last payment received.
I go over it once a month or so and check I've received all payments.
I have a lot of programs where I get paid only for webmaster referrals and I have to hunt a couple of programs down ever month.
This site is good for sponsor/ePassporte names and finding sponsors.
http://www.adultsponsordb.com/other/epassids.php
(ePassporte or myself are in no way associated with this site)