Ask HN: Password managers

HN is a security savvy crowd that, I assume, does not like to reuse the same password on multiple sites of dubious security. What software do you use to manage the proliferation of passwords, user id's, and email addresses you have to give out to register on so many websites? Do you synchronize these across multiple browsers/boxes?

Is there market opportunity for a piece of new password management software? What features aren't there that should be?