Just like Nic Wolff, I hate remembering passwords. Nic created a brilliant password generator which uses a master password, the site name (or domain name), and a bit of MD5 encryption - this produces a different password for each site, and it's impossible to reverse-engineer your original master password from it. Now, you only need one password, and no amount of embarrassing SQL hacks will worry you. Hurray.
Nick produced a bookmarklet to generate this password. Johannes la Poutré produced an excellent Greasemonkey script which almost automates the entire thing if you use Firefox. It's just brilliant.