Awardwallet.com
I've tried Yodlee, MileTracker/ MilePort (they are the same thing), and points.com -- for the 30+ programs I belong to, AwardWallet is the ONLY one with perfect, bug-free coverage. Yodlee had about 90% coverage, MileTracker/ MilePort had 50% and much of that was buggy, and points.com covered only a few programs.
They also have a superior security model: they provide a means of NOT storing your passwords out "in the cloud" on their site, instead storing them on your own PC. (I used to run a global IT Security software company -- so there is some reason to believe me when I say this is better!).
On the few occasions I've had requests or feedback for the AwardWallet team, they have been EXTREMELY responsive, even adding a couple of obscure programs at my request (FlyPorter and Malaysia Enrich).
Highly recommended!
Cheers,
R.