Missed this completely while working onsite for the last {forever}!

TMG SP1 is here.

There’s an X64 version for the Server and/or EMS, and a 32-bit version for just the MMC bits on computers you use to remotely manage the boxes.

Installation Instructions

Downloads: http://www.microsoft.com/downloads/details.aspx?FamilyID=f0fd5770-7360-4916-a5be-a88a0fd76c7c&displaylang=en