DNSchanger: malware that can kill your internet connection. Info from OpenDNS.

Flashback virus attacking OS X.

For info: NY Times Blog

A note on Dr. Dave's video security course: The course was designed for OS X 10.5 and remains valid for 10.6. Security enhancements in OS X 10.7 supercede much of the specific content, although the general concepts are still valid. If you have upgraded all of your Apple computers to 10.7 you may not need this course, but if you are still using 10.6 or earlier we urge you to check out the videos - just click on the link to Dr. Dave's Video Book on the right ->