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If you are using the Visual Studio Team System Database Edition (Data Dude), you will want to upgrade to the latest version that came out at end of April 2009. http://www.microsoft.com/downloads/details.aspx?FamilyID=bb3ad767-5f69-4db9-b1c9-8f55759846ed&displaylang=en
Reason's to update:

• You don't need a design database (typically express edition installed for you) "Database Edition no longer requires a Design Database. Therefore, it is no longer necessary to install an instance of SQL Express or SQL Server prior to using Database Edition."
• It now also supports SQL 2008,
• Distinct Build and Deploy phases,
• Static Code Analysis (Including the ability to develop and deploy custom rules)
• New Refactoring Operations (Wildcard Expansion, Move Schema, Fully Qualify, Extensibility point which enables the ability to develop and deploy custom refactoring types and targets
• Dependency Viewer, and
• Improved integration with SQL CLR projects.

Don't forget to have VS 2008 SP1 installed and follow the install instructions:
Install
Localized versions of the GDR for Visual Studio Team System 2008 Database Edition will be available in the same languages as Service Pack 1 for Visual Studio 2008 (SP1). Each language-specific version of Database Edition must be installed on a version of Visual Studio 2008 SP1 that is running the same language. For example, the French GDR for Database Edition must be installed on a French version of Visual Studio 2008 SP1. If you would like to install a non-English version of the GDR for Database Edition, replace “English” with your language choice in the following instructions.

1. Install Microsoft® Visual Studio Team System 2008 Database Edition SP1 (English) or Microsoft® Visual Studio Team System 2008 Suite SP1 (English)
2. Uninstall the Database Edition Power Tools if installed. To uninstall the Power Tools from the command line, use: msiexec /X {EA016DAB-E08A-46FB-BBF0-ED6EB8FD4671}
3. Uninstall any previous version of the GDR for Database Edition. To uninstall a previous version of the GDR from the command line, use: msiexec /X {DDF197C6-4507-3A19-A4B5-0E17CC931370}
4. Install Microsoft® Visual Studio 2008 Service Pack 1
5. Install Visual Studio Team System 2008 Database Edition GDR by running the self-extracting executable SETUP.EXE.