As Gareth announced the DSL Tools are now an official part of the VS 2005 SDK. Our DSL Tools (Nov 2005) CTP has been integrated into the Feb 2006 CTP of the VS SDK.
That means we won't offer the CTPs of our DSL Tools as download on the DSL Tools homepage anymore. Interested users just get them together with the rest of the VS SDK, which DSL Tools users need to install anyway.
For us that is another step towards our V1 release ...
Jochen