After working on this article for a couple of weeks on my spare time this Troubleshooting Survival Guide is now ready for you, check it out at:
As you know, this is a Wiki article and you can contribute with it, but first take a look and see if you like it
A great addition to the TMG Survival Guide would be an updated process for the Branch Office VPN Connectivity Wizard. This feature does not have much documentation or mention in books about TMG (that I'm aware of) and this process was very difficult to put together until I found the article for ISA 2006(technet.microsoft.com/.../bb794783.aspx). The article doesn't seem to be a good fit for the same process in TMG 2010, and this is one of the primary goals of TMG in my organization.
Thanks for the suggestion Nathan, I will keep that in my "To Do List" for the next version or so.