Think Secret just announced that Mac OS X 10.4.3 was released, and I am currently updating my laptop now. Apple’s support site says it includes fixes for:
– AFP, SMB/CIFS, NFS and FTP network and file services
– AirPort and Bluetooth wireless access
– Core Graphics, Core Audio, Core Image, and RAW camera support
– disc recording when creating and burning media
– .Mac sync services
– Spotlight indexing and searching
– Dashboard widgets: Dictionary, Flight Tracker, Stickies, and Unit Converter
– Address Book, AppleScript, Automator, Dictionary, Font Book, iCal, iSync, Mail, and Safari applications
– Disk Utility, Keychain Access, Migration Assistant, and Software Update
– compatibility with third party applications and devices
– previous standalone security updates

Source: Think Secret – Briefly: Apple releases Mac OS X 10.4.3
More Info: Apple – Support – Downloads – Mac OS X Update 10.4.3