Brian Randell has recently published a set of VSTS virtual machine images for Virtual PC, Virtual Server and Hyper-V. You can download either the TFS-only version, or the VSTS "all-up" images that contain the latest bits such as:
- Team Foundation Server 2008 SP1
- Team System Web Access 2008 SP1
- Visual Studio Team System 2008 SP1
- Power Tools October 2008
- and more...
See Brian's blog post for download links.