Ha, so I am preparing to deliver an overview of Vista deployment scenarios this afternoon and over the weekend I created a slide that called out the Hardware Assessment tool and Easy Transfer Wizard Companion as out of scope for a detailed discussion since neither had not been released yet. Wouldn't you know it - the day of my presentation, this gets released! I am really happy it's available and look forward to testing it.
The Windows Vista Hardware Assessment solution Accelerator is an inventory, assessment, and reporting tool that will find computers on a network and determine if they are ready to run the Windows Vista™ operating system.
Source: Windows Vista Hardware Assessment: Overview