I used to use the same password for most of my accounts. I have accounts with google, yahoo, msn, bloglines, delicious, mybloglog etc. If I had different passwords it would be a hassle to try to remember them all. I discovered a cool program call KeePass from Lifehacker. With it I generated different secure passwords for each website. The program also has a autotype function which allows me to login with one click of a mouse or a hot key.
KeePass is a free/open-source password manager or safe which helps you to manage your passwords in a secure way. You can put all your passwords in one database, which is locked with one master key or a key-disk. So you only have to remember one single master password or insert the key-disk to unlock the whole database. The databases are encrypted using the best and most secure encryption algorithms currently known (AES and Twofish).