The honeymoon is over Mac users. 600,000 Macs may be infected with a new virus as of this writing. Mac Flashback Trojan is affecting users using Java for OSX. If you haven’t run a software update yet for your Mac, go to the Apple Menu, (TOP LEFT of your screen) and select Software Update… to update your machine. Once this is done, go to the trusted site below from f-secure and follow the instructions which will check to see if you have the virus and how to remove it.

http://www.f-secure.com/v-descs/trojan-downloader_osx_flashback_i.shtml