I stumbled across this tip on how to avoid the creation of the 100mb hidden partition during a clean build of windows 7... and thought I would share it, if it hasnt been already...
http://www.shivaranjan.com/2009/05/11/how-to-prevent-windows-7-from-creating-a-hidden-recovery-system-reserved-partition-during-installation/
http://www.shivaranjan.com/2009/05/11/how-to-prevent-windows-7-from-creating-a-hidden-recovery-system-reserved-partition-during-installation/