If you already rushed out to purchase a Magic Trackpad or one of the brand new iMacs Apple announced on Tuesday morning, then it's time to do the Software Update dance. The company has rolled out a pair of updates for Mac OS X 10.6.4 and Mac OS X 10.6.4 Server installations running on the new desktop models, as well as software updates for those who want to use the Magic Trackpad with their existing Mac.

The Mac OS X 10.6.4 update for the mid-2010 iMac resolves compatibility and performance-related graphics issues, improves compatibility with large-format SDXC memory cards, and adds support for Apple's new Bluetooth Magic Trackpad. It clocks in at 452.62MB and contains all the same fixes as the Mac OS X 10.6.4 update issued in June.

The server update, Mac OS X Server 10.6.4 for the mid-2010 iMac brings the same updates found in the Mac OS X Server 10.6.4 update also released last month. The download is 460.91MB and requires Mac OS X Server 10.6.3 or later.

Apple iMac

The 75.09MB Magic Trackpad and Muli-Touch Track Update 1.0 brings support for the Magic Trackpad to any Intel-based Mac running Mac OS X 10.6.4--but note that you'll have to have the Magic Trackpad paired and connected to your computer for the update to show up and install. The patch adds a Trackpad pane in System Preferences for configuring the Magic Trackpad and also implements the three-finger drag gesture and inertial scrolling to a host of Mac portables released over the last two years. It also adds inertial scrolling (but not the three-finger drag gesture) to the MacBook Air and MacBook Air (Mid 2009) models as well as the 15-inch and 17-inch MacBook Pros from early 2008, as long as they're running Mac OS X 10.6.4.

Finally, for those who want to use the Magic Trackpad with a Mac running Windows via Boot Camp, you'll have to download the Apple Magic Trackpad Update 1.0 for Windows, available in both 32-bit and 64-bit flavors. The patches support Windows XP, Vista SP2, Windows 7-32, Vista 64, and Windows 7-64 and require Boot Camp 3.1.

In addition to being available at Apple's support download site, most of the updates should be available on the applicable computers via Software Update.