Josh, you beat me to it. I can officially clear this from my Outlook 2007 todo bar. Great article.
When working with schools on BDD I try to find time to show how to enable the wizard page that automatically sets up the image install as prepared for Bitlocker. If you have machines already deployed and need a tool to build a partition and move your boot files for BitLocker, this is what you are looking for. Josh fully spells out how to use it.
Link to Josh's Windows Weblog : BitLocker Drive Preparation Tool