Get it here! This was just released a day or two ago.  It's called the Windows Vista Hardware Assessment.  Here is the description from the tool's web page:

Secure and Agentless Inventory

The Windows Vista Hardware Assessment solution accelerator provides secure, agentless inventory for up to 5,000 computers. It collects and organizes system resource and device information, network wide and remotely, from a single networked computer. Assessment tools often require users to first deploy software agents on all computers to be inventoried. The Windows Vista Hardware Assessment does not require the deployment of any software agents on the individual computers.

Whether you're doing an assessment on your own, or if you're a Microsoft Partner who is helping their customers get ready, this is a must-have! 

Get it from here.