Got the following a few weeks ago in my email. Have not tried it myself though...
ThisIsTheNuts.com
Full Tilt and Absolute Poker have authorized us to convert existing accounts that do not have rakeback to 27% rakeback for Full Tilt and 28% for Absolute Poker.
All payments will be made directly into your Full Tilt or Absolute Poker account and both sites still accept U.S. players.
If you wish to convert an existing account to rakeback please reply back with the following:
Site Name
Account Name
Name Registered Under
Email Address Registered With Site
I will then coordinate the update of your existing account for rakeback within approximately 48-72 hours and will provide you with a link to add your existing account to our system for internal reporting purposes and daily statement.
In addition, we can’t convert old UB accounts at this time but beginning Oct 1st all UB rakeback accounts under TITN will be increased to 35%. If you don’t have a UB account, now would be a good time to sign-up under TITN.
Regards,
Alex
TITN