Apple has released a firmware update that addresses a handful of issues on early 2009 Mac Pros. The update improves "compatibility with virtualization products utilizing VT-d, storage performance under Windows XP for Boot Camp users, and system reliability during the boot process." To install the update, follow the instructions in the updater application that launches automatically after the installer has closed (/Application/Utilities/MacPro EFI Firmware Update.app). More information regarding installing a firmware update on an Intel-based Mac is available on Apple's Web site. The update is available via Software Update and the Apple Support Downloads page. (Free, 1.96 MB)
Improve Apple Services with AirPort Base Stations
You can make iChat file transfers, iDisk, and Back to My Mac work better by turning on a setting with Apple AirPort base stations released starting in 2003. Launch AirPort Utility, select your base station, click Manual Setup, choose the Internet view, and click the NAT tab. Check the Enable NAT Port Mapping Protocol (NAT-PMP) box, and click Update. NAT-PMP lets your Mac OS X computer give Apple information to connect back into a network that's otherwise unreachable from the rest of the Internet. This speeds updates and makes connections work better for services run by Apple.