http://lastpass.com/ http://supergenpass.com/

Between work and personal, roughly 130 password/account pairs.

I may be missing a few. I also don't believe in gratuitously creating accounts simply to make use of some site (information has value, including and often particularly, identifying information). I'll make use of BugMeNot and/or create throwaway accounts using Mailinator for one-offs.

Wish they'd add a system for private/public key storage though.