Apple has released a small update to Lion called Mac OS X 10.7.3 Supplemental Update. The update is apparently a bug fix for an issue with restoring from a Time Machine Backup.
About Mac OS X 10.7.3 Supplemental Update
This update resolves an issue when restoring a Mac from a Time Machine backup.
The update weighs in at 24.55MB and is recommended for all Lion users who have Time Machine backups. It can be downloaded from Apple’s software update web page.