I didn’t think we’d ever see this!  Ori on the Forefront TMG product blog has announced Update 2 for TMG SP1, which includes support for NLB with teamed or VLAN Tagged NICs.  The blog entry is here: http://blogs.technet.com/b/isablog/archive/2010/11/30/support-for-nlb-on-vlan-tagged-or-teamed-network-adapters.aspx & the update itself here: http://support.microsoft.com/kb/2433623/

Rob