Apple today has released the 10.5.6 update. The update includes many fixes and updates for Airport, Networking, MobileMe, and on and on. You can get it now via software update. See all the updates below:Read More
The update is available via software update on your Mac.
"This software is recommended for all users and provides enhanced customization capabilities and improved performance for migration over FireWire, ethernet, and wireless networks."
Let us know if you see anything good or bad during or after the install.