Windows Azure Tools for Microsoft Visual Studio (includes SDK).  If the release is still propagating, try the Direct Link.

New for the May 2009 CTP:

• Support for Visual Studio 2010 Beta 1
• Update for Visual Studio 2008
• Improved integration with the Development Fabric and Storage services to improve the reliability of debug and run of Cloud Services from Visual Studio
• Enhanced robustness and stability

Release notes/Known issues are available here

Visual Studio 2010 compatible samples are available here

Please see this post for more information.