Apple has released an update to OSX Lion which among other things fixes and issue with the FileVault security hole.
Here'e the release notes:
The 10.7.4 update is recommended for all OS X Lion users and includes general operating system fixes that improve the stability, compatibility, and security of your Mac including fixes that:
- Resolve an issue where the “Reopen windows when logging back in” setting is always enabled
- Improve compatibility with certain British third-party USB keyboards
- Address an issue that may prevent files from being saved to a server
- Improve the reliability of copying files to an SMB server
