I'm a big fan of LastPass. Completely cross platform, cross browser. Good browser integration, 256bit encrypted local storage syncable cloud (encrypted files are sync'd via their Web site), has some OTP functionality and multi-factor capabilities. Password can be shared with other users if you say so. Flash drive option. Form data as well as passwords. Free, with a premium for-pay model that I've never felt was needed.

Also heard good things about KeePass, but I've not actually used it yet, so take that for what it's worth.