Visual Studio 2010 Beta 2 was released this week. The only change I see (comparing to VS window tabs management in 2010 Beta 1) is the new Insert documents to the right of existing tabs option that allows opening tabs on the right:

Insert documents to the right option
I’ve updated Tabs Studio to accommodate some Visual Studio 2010 Beta 2 internal changes and I will make it available in the next release:

Tabs Studio in Visual Studio 2010 Beta 2
As VS 2010 release date is set to March 22, 2010, I’ve extended evaluation period for Tabs Studio 2010 to April 22, 2010.