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1Password is great! Can be synced with Dropbox, and you can also buy the desktop app.

One thing I think is great is that you can also open the keychain file in a browser (e.g. In a net cafe) and view your passwords and CC without having the 1Password app installed :)
 
For $18 iOS and $40 Mac or Windows ($56 for Mac+Windows) it better be brilliant!

KeePass for Mac/Windows and MiniKeePass for iOS is the poor man's solution. Doesn't integrate into your browsers like 1Password will...but I don't like stuff like that tied to my browers, personally.
 
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