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.
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