http://www.isascripts.org/ – a bunch of handy scripts by a security consultant named Jason Fossen
Microsoft tools for TMG 2010 – http://www.microsoft.com/downloads/en/details.aspx?FamilyID=8809cfda-2ee1-4e67-b993-6f9a20e08607&displaylang=en
Technet Doco for TMG 2010 – http://technet.microsoft.com/en-us/library/ff355324.aspx
Jim Harrison’s list of tools for TMG2010 – http://www.isatools.org/tools.asp?Context=TMG2010
Microsoft ISA Blog – http://blogs.technet.com/b/isablog/