The latest driver I can find for this NIC is XP/2003 and won't work for longhorn. Any ideas on how I can get this NIC to work on this machine. Thanks, Kevin

Unfortunately till Intel releases compatiable drivers you are stuck, you could try an alternate NIC card till drivers are available for that one

is there a listing of supported NIC's? Thanks

Not yet. We're continually working with our hardware partners to get updated drivers for devices to support Windows Server "Longhorn" and new drivers are appearing all the time. We will publish a list of supported devices closer to release.