Visual Studio 2010 Beta 1 shows lots of T4 usage + tangible T4 Editor for VS2010 Beta 1 is available!

As Somasegar pointed out VS 2010 Beta 1 ships now. VS 2010 Beta 1 includes new Code Generation Features based on T4.  In VS2010 Beta 1 T4 is now also used in Entity Framework 4.0 and in the new Modeling Support of the Architecture Edition. Note that VS2010 Beta1 now also brings it's own T4 item templates.

For some cool screenshots of the code generation features and a Free T4 Editor for VS2010 Beta1 be sure to checkout the tangible engineering blog .

Dev10Modelling