I'm pleased to say that thanks to our stirling User Education team, we've now got a first CTP of documentation around the DSL Tools.
 
This tranche is focussed on the T4 Text Templating engine and you can download it here.
 
Enjoy.
 
 
Update:
Jonathan Perret pointed out that with XPSP2 you may need to unblock the .chm file to use it.
Right-click the file in Explorer, 'Properties', then click that newfangled "unblock" button.
thanks Jonathan