The old Keychain Access application made it difficult to find a forgotten password. It presented a list of possibly hundreds of files sorted alphabetically, but this did not help much when the keyword was in the middle of the file name.
Tiger's Keychain Access now has a search window. Put in a keyword (such as macosxhints), and matching keychain file(s) will appear instantly. Click on the file, enter your administrator password, and you're back in business.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050506120123553