I really respect the work of Bruce Schneier but I had to check the date today to make sure it wasn't April Fools. Bruce Schneier & Jesper Johansson (Microsoft) are recommending that users create complex passwords and write them down! See Write down your password today | The Register

There are many well documented mnemonic techniques for remembering passwords. Once you have a good system its not that hard to generate and remember strong passwords.

Also there are tools like KeePass which mean that you only have to remember a single strong password.