If your software update hasn’t notified you yet, Apple has released a pretty extensive security update. It’s not a bad idea to go ahead and manually update your system to get it out of the way.
Here’s a breakdown of what is in the update:
Security Update 2007-004 is recommended for all users and improves the security of the following components:
For detailed information on this update, please visit this website: http://docs.info.apple.com/article.html?artnum=61798