You need a password for the Windows network logon, your e-mail account, your homepage's ftp password, online passwords and so on. The list is endless. Also, you should use different passwords for each account for security reasons. Therefore; you have to remember many passwords. With KeePass, you can store your passwords in a highly-encrypted database, which is locked with one master key or key-disk.

For download;

http://sourceforge.net/projects/keepass