Mac OS X 10.3.6 update is now available through Software Update. This update provides the following improvements:

- improved file sharing for Mac (AFP), UNIX (NFS) and PC (SMB/CIFS) networks
- more reliable network automounts and launch of network applications
- improved OpenGL technology and updated ATI and NVIDIA graphic drivers
- additional FireWire audio and USB device compatibility
- updated Calculator, DVD Player, Image Capture, and Safari applications
- improved compatibility for third party applications
- previous standalone security updates

For detailed information on this Update, go here [1]
For detailed information on Security Updates, go here [2]

Apple has also updated DVD Studio Pro to version 3.0.2, adding double layer media compatibility and improving stability. It's the first time Apple supports officially the DL format.