Apple has released Safari 5.1.1 along with OS X (10.7.2) Lion and iOS 5. The main feature on Safari 5.1.1 is it's support for iCloud which will allow you to sync your reading lists.The Safari update brings also Reading Lists which allow you to save interesting articles and read them later on your Mac or even iOS device thanks to iCloud.
The update also offers increased performance with a 13% improvement in Javascript performance over Safari 5.1. Other improvements include better PDF handling, improved response in pinch-to-zoom and updated printing features.
Safari 5.1.1 comes packaged with OS X 10.7.2 but can also be downloaded separately from here.