The OS X Lion v10.7.3 Update includes Safari 5.1.3 and fixes that:

Add Catalan, Croatian, Greek, Hebrew, Romanian, Slovak, Thai, and Ukrainian language support
Address issues when using smart cards to log into OS X
Address compatibility issues with Microsoft Windows file sharing
Address an issue printing Microsoft Word documents that use markup
Address a graphics performance issue after sleep on some earlier iMacs that use ATI graphics
Resolve a Wi-Fi connection issue when waking from sleep
Address an issue that may prevent Safari from opening before joining a wireless network
Fix a potential issue authenticating to an SMB DFS share
Include RAW image compatibility for additional digital cameras