also, if you done the detailing in subd, and still want to keep the changes in the polygon (except creases of course) you can select a higher level when you convert subd->poly. so select vertices as kurt suggested in settings, but instead of level 0, change to level 1 or higher. just be carefull that you cannot convert back to poly and subs repeatedly or you would make the geometry more and more complex with every step - if you leave at level 1. so by default it should be level 0 - and you can go back and forth from subd to poly and poly to subd and you always end up with the same thing (this works faster than working in poly proxy mode in subd). also note that converting level 1 verts is differant (if you worked on level 1 mode in subd) than converting level 0 verts and then smoothing in poly mode.