Cisco NAC appliance 4.7.1 was just recently released. The main new features are support for Windows 7 and Apple Macintosh OS 10.6 (Snow Leopard).
Mahesh Naidu, Cisco PMBU Product Manager, also made another interesting announcement on the Miami University NAC Mailing list. He stated that a separate “NAC sustaining engineering team” was created to support the operational side of NAC. This included dedicated support for OSs, service packs, hot fixes, browsers, and security software versions.
Here are some quick links to the new documentation