Mike Niehaus has posted a blog entry about issues and workarounds for WAIK Win 7 SP1….. realisticially, the guts of it is – dont use this version of the WAIK yet…. (do people even use the WAIK outside of MDT and SCCM ?)

http://blogs.technet.com/b/mniehaus/archive/2011/03/12/issue-with-mdt-2010-update-1-and-windows-aik-for-windows-7-sp1-supplement.aspx