Windows Vista - Guidelines for purchasing a PC now that can run this new OS
http://www.microsoft.com/technet/windowsvista/evaluate/hardware/vistarpc.mspx
Computers with the Windows Vista Capable PC logo will meet or exceed the requirements to deliver the core Windows Vista experiences such as innovations in security, reliability, organizing and finding information. They can also deliver key business features found in the Windows Vista Business and Windows Vista Enterprise versions, such as domain join.