Runbox Mail Manager are running an affiliate program that pays affiliates $11 for each paid subscription to their email service.
They offer ad-free email accounts with 100MB of storage, IMAP, POP3 and web-based access, WAP access and all kinds of other goodies.
I have been a beta-tester/guineapig in their affiliate program for close to a year now, and I can tell you they pay on time, like clockwork, 15 days after the end of each month. Their affiliate program manager, Liz, is very responsive to questions and suggestions.
I have had great success getting signups from people looking for free email services ("Tired of the limitations of free email? Try Runbox...") so I guess it would also do well on a general "freebies" site as well as a webhosting resource site (some people may be looking for an email solution only)
Normally, people signing up under another affiliate will receive a special rate of $12 a signup (as an incentive to use their referral code). However, Runbox has allowed me to offer an exclusive rate of $13 a signup - that's a $2 bonus on EVERY signup! Note: The $2 bonus will be calculated manually and added by the Runbox affiliate manager when she processes your payment.
Runbox is at http://www.runbox.com/ (you can sign up and test their service free for 30 days if you want to see what it's like)
To get the $13 a signup rate, you must enter "1300" in the "Referred by" field of the affiliate signup form. This is not retroactive - you must enter it when you first join the affiliate program. If you enter anything other than "1300" you will NOT get the $2 bonus.