Get it here http://msdn2.microsoft.com/en-us/vstudio/aa700831.aspx.
Visual Studio 2008 Downloads
|Get an early look at Visual Studio 2008|
The next version of Visual Studio, Microsoft® Visual Studio® 2008, will provide an industry-leading developer experience for Windows Vista, the 2007 Microsoft Office system, and the Web. In addition, it will continue in the Microsoft tradition of development language innovation. To enable early feedback, this page provides links to prerelease versions of Visual Studio 2008, and for technologies that we plan to include in it. As previews of additional technologies become available, we will make them available from this page.
We encourage you to download and try these early releases. Before installing a release, review the prerequisites as some releases may require additional software prior to installation. As with all prerelease software, we encourage you only to install these on a secondary machine, or in a virtual machine, as they are not supported by Microsoft Services support teams. As the goal of these previews is to gather feedback from the developer community, please use Microsoft Connect to report any issues, or to suggest improvements.