Last night Apple released an updated version of Java. Since a Java security hole is how the Flashback virus spread so rapidly, we recommend you update your computer right now before the bad guys figure out how to exploit the old version.
You can do this yourself by running "Software Update" from the Apple menu. Although we encourage you to install all the recommended updates that you may see listed, the Java update will not require a reboot if installed by itself, and so you can do this at your convenience.
Please contact us if you have any questions or concerns.