Somasegar (VP in charge of DevDiv) has just blogged that Visual Studio 2010 Beta 1 has been released to the web. It will be available on MSDN in the next few hours, and available as a public download on Wednesday. (We will be releasing a matching Visual Studio SDK soon also.)

Beta 1 is the first time that you’ll be able to get a glimpse at the new Visual Studio Extension Manager as well as the other new features coming (WPF based Shell/Editor, MEF-based editor extensibility, Architecture Explorer, etc…).