I only have a half-dozen or so passwords that get shared around, but I could never remember which site uses which password without help. So they're all listed in a spreadsheet, with an unrelated file name. Perfectly safe, as far as I'm concerned; no-one else can access any of my PCs and I doubt if anyone would be interested in a "list of books" anyway.
I have used this program to store my passwords for around 18 months or more, without any problems. With this program you can choose for it to randomly choose a password for every entry you store, the randomly choosen passwords are a combination of letters (lowercase and uppercase) and or numbers as well, so its a very secure password and also the passwords that are stored are encrypted by various method, also this program is free. I cannot recommend this program enough.
click here Whisper 32, the data fits a floppy or usb dongle and is password protected so that you only have to remember 1 password, You can keep multiple data on say bank account memorable words, account numbers, passwords, etc. I have used it for years, no probs and it is FREE.
RoboForm - VoG's link - is excellent. The newer free versions offer only 10 passwords, but an older free v5.7.6 will give you 30 - to download this older version click here (<---direct download).
I've tried Belatucadrus' programs, but the only other one (apart from RoboForm) that suits me is the free unlimited Any Password click here (I use them both as I have over 200 passwords to remember - don't ask!)
As ?. mentions, Firefox has it's own built in password manager. G