Mac OS X 10.4.4 is now available for download via Software Update, following Apple CEO Steve Jobsi announcement of the update earlier today.
The highlighted fixes, as noted in Software Update, include:
SMB/CIFS and NFS network file services
Bluetooth wireless access
Core Graphics, Core Audio, Core Image, RAW camera support, including updated ATI and NVIDIA graphics drivers
Spotlight indexing and searching
AppleScript, iChat, DVD Player, and Safari applications
Dashboard widgets: Calendar and Stocks
Software Update and Sync Services
compatibility with USB and FireWire devices and third party applications
previous standalone security updates
Additional information on the Mac OS X 10.4.4 update is available here, while the 55MB download can be found directly on this page. (The updater via Software Update weighs in at a lighter download, depending on your system configuration.)
A Combo Updater for Mac OS X 10.4.0, 10.4.1, and 10.4.2 users is also available as a 120MB download.