First things first, you need to see the post on how to root your droid, located here:
http://forum.ppcgeeks.com/showthread.php?t=102966 After you have done that, boot into recovery mode (Hold X on the keyboard while powering up) on your phone and create a backup of your stuff (Backup/Restore, create a simple nandroid backup). Reboot normally and mount SD to your PC. Go into the nandroid folder on your SD and move the folder that is in there (Should be named something like BCDMRS-DATE AND TIME) to a safe place on your PC. Take the similarly named folder from the zip file I uploaded, put it in your nandroid folder, reboot into recovery, clear user data, format system and cache, and perform a default nandroid restore. Then your like nextel....done!