As you probably know in the 2.1 upgrade the Recovery 'bug' has been fixed , ( Recovery bug woudl allow for an unsigned update.zip file to be applied ) . In order to be able to root 2.1 on our milestone a 'rootable recovery is needed , thanks to nadlabak this is now possible , just use RSD lite and flash this ( after updating to 2.1) . Once this has been applied you can now root your phone .

here is file :

vulnerable_recovery_only_RAMDLD90_78.zip