I feel these gadgets are gimmicky at best. It's better to use an encrypted software method, with the need to remember just 1 main password.
There are several free password managers out there. One of the best is the free Roboform click here. New free ver will allow only 10 passwords, but there's an older free version that supports 30 - v5.7.6, which can be downloaded from click here.
Other free password managers to try:
1. Access Manager click here (UK-based company. It requires the Microsoft .NET Framework click here - you may already have it depending on your OS)
2. Any Password click here (which I use alongwith Roboform as a 'backup')
3. KeyWallet click here 4. Oubliette click here
5. Key Folder click here
6. 4UOnly click here
7. LoginControl click here
8. Whisper 32 click here
9. More at click here