I had posted earlier about how you can remove the Mac OS X Mac Defender malware.
Apple has just posted a Support note on how to remove it as well.
Apple also says that they are coming out with a Mac OS X update that wi automatically find and remove the malware.
In the coming days, Apple will deliver a Mac OS X software update that will automatically find and remove Mac Defender malware and its known variants. The update will also help protect users by providing an explicit warning if they download this malware.