Here's an earlier thread about the GM CDs:
http://www.elcova.com/groupee/forums?a=tpc&s=2826088551&f=5106011751&m=290600288 2&r=6306056882#6306056882
You can order the H2 service manuals (highly recommended) from Helm, Inc:
http://www.helminc.com/
Be forwarned that the GM CDs are really for dealerships. The updates usually only work a few months, as GM will send out a new set of CDs, and the updates will not update older CDs.
It can get expensive posting TSBs!
Klaus
"God made some men big and some men small, but Sam Colt made them all equal."