TL;DR; The release candidate for Visual Studio Team System 2008 Database Edition GDR offers upgrade support to RTM, with setup files, documentation, and user manuals available.

Gert Drapers has just announced the long awaited RC for the Data Dude GDR. This is the first version that you can seriously consider using as, unlike the previous CTP’s, there will be an upgrade path to the RTM.
You can download the Release Candidate from the following location:
- Setup
http://download.microsoft.com/download/0/a/e/0ae1153a-8798-474a-93e6-d19299f37c8b/setup.exe- Read Me
http://download.microsoft.com/download/0/a/e/0ae1153a-8798-474a-93e6-d19299f37c8b/Readme.mhtDocumentation:
http://download.microsoft.com/download/0/a/e/0ae1153a-8798-474a-93e6-d19299f37c8b/Documentation.zip
Contains:
* Visual Studio Team System 2008 Database Edition GDR User Manual
* Visual Studio Team System 2008 Database Edition GDR API Reference
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