RoboForm for the Mac?
When I switched to the Mac, the first thing I googled was "RoboForm for the Mac" - sadly, it does not exist. But, I did not despair long, for there was already a great product for the Mac that supported not only Safari and Firefox, but Camino and other browsers as well: 1Password
This is a great product - you can even import your RoboForm passcards.
For those switchers out there, check out the Switchers' Blog