I think I know my background since 3/4 of my family "came over on the last boat" as my mother put it - maternal grandparents both came from Poland and my paternal grandfather's parents both came here from Ireland. But my maternal grandmother's ancestors were Dutch and came in the 1600s, so there's a lot I obviously don't know. But my grandmother's aunt commissioned a book that traces them from the very first ancestor - I used to pour over it - so I'm not expecting any surprises, but you never know. 
And that's something I never considered - how this could help adoptees! It could be pretty amazing if it could help you locate family members! What an incredible find that could be! I really hope you are able to learn what you're looking for... 
I also read that if you're female, it's helpful to have a close male relative do it, as well - since we have only Xs and a Y chromosome gives additional information. I want my brother to do it for that reason, but he figures he knows all he needs to, isn't particularly interested. I told him that all I need is some of his spit... 
As for the DU Genealogy Forum, I helped start that on DU.2, kind of lost track of it... 
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