By now you've probably heard about the Flashback, the Mac's latest virus scandal at least 10 million times, but the folks who discovered the thing just released a tool to help you detect and get rid of it really, really easily.
F-Secure is currently offering an AppleScript that you download and run. It checks your system for Flashback and removes it if found. That's all there is to it. Supposedly Apple has their own tool forthcoming, but if you don't want to wait (and why would you?) you can take care of business in a snap right now.
Flashback Removal Tool [F-Secure]