You can also update JAVA via Apple’s Software update, or download it from this page (updated link to Java for OS X Lion 2012-002).
In the meantime, I whipped up a quick video tutorial on how to protect your Mac by turning off JAVA in Safari.
Not sure if you’re infected? Christina Warren wrote up some AppleScripts to determine if your Mac is infected (download link is at the bottom of her page).
If you have any questions, do let me know!