Just posted on the PPC Geeks news site:
http://www.ppcgeeks.com/2010/03/04/m...buying-an-htc/
Basically all the Milestone customers have been pressuring Motorola to allow the phone to run on custom ROMs. Currently the milestone's bootloader won't run unsigned software so even if it's rooted, users can't install ROMs. Motorola responded by saying they will never unlock it and users who want to do this kind of thing should by an G1 or Nexus One (which allows users to load custom ROMs if they chose to void their warranty.)
This makes me even more resistant to allowing Motorola to install updates on my phone.