The dmupdater puts you back to stock. But to be sure....manual steps work too....read my sig links.
The first one has some steps in it to get you back to root and the last one definitely gets you back to stock in 8 steps.
[video=youtube;AEj_grcVK24]http://www.youtube.com/watch?v=AEj_grcVK24&feature=player_embedded]YouTube - Motorola Droid - How to UNROOT your device - The EASY way![/video]
Sholes stopped being Sholes like a month ago... That group of Devs now operate under the name DroidMod, and their app can be downloaded on the market. It works just like SholesMod Updater did.