Yesterday National Geographic News published that Prof. Pearson, involved in the recent digs of the Megalithic monument, suspects that it was primarily a place of dynastic (or otherwise elite) burials. This in contrast to other researchers' opinions that have suggested it was a "Neolithic Lourdes" and the more classical astronomical understanding of the landmark.
It is a very interesting and intriguing issue and while I don't feel right now like to write too much about it, I have made some contextual meditations on the issue in Stone Pages' Archaeo Forums, if you are interested.
Another interesting article is found at the University of Bristol site. Thanks to PeteG for it and also for the announcement that further excavations are expected soon in the NW part of the monument.