I've hypothesized in a previous post that Y-DNA R1b may have a Bell Beaker culture source in Western Europe. New ancient DNA data showing two Bell Beaker men with Y-DNA haplogroup R1b support that conjecture, although the sample size is too small to be definitive. These are the oldest European Y-DNA R1b samples of which I am aware and were found in Germany.
Update (May 4, 2012): Maju's post on the study notes that R1b is a contrast with early Neolithic ancient DNA from the vicinity of this find stating that "we do
know that some local precursors were of other patrilineages: F*, G2a3 (local
Danubian) and R1a1 (from Eulau, right across the Elbe)."
Maju also expressed some skepticism about the identification of the remains which are near an interference between the Bell Beaker "phenomena" and the Corded Ware culture the flourished in Europe to the east of the Bell Beaker area (the dates would be consistent with either), on the grounds that the grave goods found with these remains don't seem to be a great fit to the prototypical Bell Beaker grave good package.
For approximately a thousand years sometime around the second or third millenium B.C.E., almost all of Europe was divided between these two cultures who had an ongoing hot and cold armed stalemate, with the Bell Beaker associated peoples generally on the West and the Corded Ware peoples generally one the East. Eventually, the civilizations on the Bell Beaker side of the divide lost.
My hypothesis is basically that the Basque people and language, and the Vasconic substrate evidenced in typonymns in much of the historically Bell Beaker parts of Europe may be the most direct linguistic legacies of the Bell Beaker people, which is otherwise more Indo-European in origin, although their population genetic legacy may have been more persistent and widespread than their linguistic legacy.