not trying to trump tank's idea, but if you can't get 2.1 rooted, and your goal is to get to 2.2 anyway, you could always try this:
http://www.droidforums.net/forum/dr...royo-step-step-installation-2.html#post528613
http://www.droidforums.net/forum/dr...royo-step-step-installation-2.html#post528613