Check-out this blog post from the Visual Studio 2010 team where they have announced that the Release Candidate of Visual Studio 2010 and the .NET Framework 4 will be supported as a “go live” release.
This means that VS2010 RC has met high standards of quality for pre-release software, and we are licensing it for developing and deploying production applications.
Can’t wait to get started? You now have permission to use VS2010 to create applications using runtimes which are “go live.” For example, the .NET Framework 4 is “go live” for this release and you can create applications both for internal use and external use. See the license terms for more details, including pre-release notifications and other details for distribution.
In order to decide whether or not using VS2010 in a “go live” scenario is right for you, you should carefully understand the terms and limitations of the “go live” license.