I'm looking for a high level overview of how one goes from an AST to working code via the DLR, does anyone have (a link for) something like that?
Here is a link that maybe helps: http://www.codeproject.com/KB/codegen/astdlrtest.aspx
Here is a good 3 part tutorial about building a basic language from the parsing to the actual tree construction to the dlr mapping.
http://www.bitwisemag.com/2/DLR-Build-Your-Own-Language
All the current DLR specs and documents are located here:
http://dlr.codeplex.com/wikipage?title=Docs%20and%20specs&referringTitle=Documentation
This tutorial is the one that I used to learn the DLR:
http://www.dotnetguru.org/us/dlrus/DLR2.htm
It builds a custom version of javascript on the DLR.
And if all else fails you can look here: http://myjscript.codeplex.com/sourcecontrol/changeset/view/8678?projectName=MyJScript#109043
to see the actual parser implementation, though I would probably recommend using Antlr as your parser. That's what I use, though I've got a fair bit of Antlr experience:)