I've been using Password Keeper on my BlackBery for years now and I think its an underused and underrated default application. It comes included with the BB OS and is a great way to keep track of usernames, passwords and any other important things you want to keep handy, but protected.
I keep lots of usernames and passwords in there and I also store things like lock combinations, healthcare numbers, air miles account number, and many more things I tend to forget but might need access to when I'm out. Its a great way to centralize important information.
The only problem comes when you forget the password protecting Password Keeper. :)
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