If you treasure your WoW account(s) and don't want them to get stolen away by a naughty keylogger, here is a way to keep your password safe from keyloggers.
Go on Google, or another search engine, and type in a random word. Many results will come up. Say you want your password to be prettypen123. From the random word search, copy and paste each letter onto a Word or Notepad document. So get a "p", and a "r", and etc. After you have it on a Word or Notepad document, all you really need to do now is copy and paste it to preserve it's safety. This way, the keylogger will have no evidence that you typed anything.
This is only if you have the type of security that lets keyloggers in :P