One of the questions I've often received about Gallio has been about whether it would integrate with MSTest and Visual Studio Team System.
Gallio running MSTest tests in Icarus
Julian did the work of writing a Gallio adapter plugin for MSTest tests. Gallio explores MSTest tests using reflection and runs them by shelling out to MSTest.exe and parsing the test result XML file.
Here's a screenshot of the Gallio Icarus GUI running some MSTest tests.
Gallio running MSTest tests in ReSharper
Of course, you can use any Gallio test runner to run MSTest tests. That means you automatically get ReSharper integration too! (And in all of the other runners too.)
MSTest running Gallio tests in Visual Studio
Another common request has been to provide integration so that Visual Studio Team Test can run Gallio tests in the IDE and using the MSTest.exe command-line.
This particular request was echoed to me a couple of times at ALT.Net from people who, for good or ill, have been instructed by management to use the Team System test runner instead of TestDriven.Net or ReSharper. So I decided to give it a shot.
Gallio Alpha 3 now includes an experimental package for Visual Studio to do just that. (It also works on the command-line).