Not only is KeePass free, it’s also open source.
What does it do? Simply put, it remembers passwords for you. I use the Internet a lot, and I have a lot of passwords, and for years I’ve tried to keep it all straight (and done a pretty good job, if I say so myself). But finally I broke down and started looking for a password manager.
KeePass fit the bill perfectly. It costs relatively little (free), it uses the most secure encryption algorithms known to mankind (well, OK, I don’t know if that’s really true but the KeePass site says the databases are encrypted “using the best and most secure encryption algorithms currently known (AES and Twofish).” So, I believe them.
Anyway, if you’re having a hard time remembering all your passwords, and you want to make a list of them (stored very securely on your computer) then get KeePass.