The search service is available to the public for established ancestors: http://services.dar.org/public/dar_research/search/?tab_id=0
You can also search for members if you know their National Number. You can also search the Descendants Database, which is very useful. This can help you determine if your deceased forbear is descended from an established DAR patriot. Descendants are available who died as recently as the 1960's. The names of the living are protected, however.