create and forget
"Avoiding the use of easily-guessed passwords is simple enough if users employ a bit of creativity and standard best practices, such as using hard-to-guess mnemonic device and mixing letters and numbers (non-sequential, obviously) in their passwords"
Based on an el reg comment some 12 months ago, I started using KeePass. Haven't looked back since. It creates, stores securely, and makes it easy to re-enter passwords in websites, etc.
Alternatively, of you suspect you won't be using the site very often, just create a bogus password and forget about it - when you come back in 6mo, it's much easier to have them send you a reset e-mail.