The increasing number of passwords you have to use on a daily basis is making things is constantly making things harder for you, as you can't come up with new passwords and promptly memorize them anymore.
The best solution is then using a password manager like FlyingBit Password Keeper. This easy yet full featured tool takes care of all your passwords, saving them to a database and then protecting it with one master password, the only one you'll have to remember from now on. The database is also encrypted using any of the four encryption methods the program supports. We did miss however having a password generator, a common extra tool in this kind of software.
Passwords are conveniently saved into several different categories and can also be sorted according to their type: web login, FTP user, email address and password, etc. On the downside, you can't export the database, but at least the program can be run from a USB key which kind of makes up for it.
Use FlyingBit Password Manager and you'll always keep your passwords safe, besides not having any problems to remember them.