Using SHA-1 to generate passwords
This is probably the worst thing about the Internet, remembering passwords.
Until about a year ago I had the same password for almost every service, sometimes I spiced it up by adding a character in the start representing the service (F for facebook, G for Gmail and so on).
A colleague had a different approach, he used simple “passwords” which he then computed SHA-1 on. He had developed a simple java script that performed the SHA-1 conversion.