>Uh why would I want to lug a megalith into a pigpen?<

Perhaps for the same reason that stones for a Lady chapel are lugged into a cathedral - ie to perform a different, secondary function.

>It is most unlikely to have been used for the swineherder as swineherds where very small, proberly the last in row of the animals to be held tame and free ranging, also there would have been alot more 'domestic' waste in the henges. A market brings more waste about than an event.<

"Pigs were the second most common domesticated animals in the Celtic world. Pigs and boars came to have a religious significance among the Celts and they were assigned to aristocrats as part of their grave goods. Pigs also play a prominent role in insular Celtic literatures. In the Welsh epics, Pyrderi possesses a herd of pigs acquired from Arawan who ruled Annwfn, the otherworld. In Irish myth, in the story of <i>Scela mucce Meic datho</i>, we find the dissection of a gigantic pig playing an important role."*

>... don't forget to put together the society and you'll be well on the way to making a good theory.<

"The religious significance of boars and pigs was widespread throughout the Celtic world where members of the nobility were assigned whole pigs or parts of them as grave goods to help them on their journey to the Otherworld."**

>Stable settlements where already in place 6000bc.<

I agree. "The prehistoric Dinas Emrys coffer-pit is shaped like an Old Stone Age vulva symbol, and echoes the Greek word <i>coiros</i>, which means both 'pig' and 'pudenda'. The ancient Greeks believed that piglets were drawn down into Demeter's underworld along with Persephone. Thus Henwen-Demeter is the mother of a piglet daughter, known in Greece as Persephone. At harvest-time Greek priestesses descended into a chasm to recover the decayed bodies of these suckling piglets, whose remains, mixed with seeds, were then scattered in the fields."*

>In other words henges where the places where knowledge was exchanged from presenting new discoveries, celebrations and ceremonies...<

Quite. I think I said that when I said, "Avebury is situated very close to the Ridgeway; ... where you've got a major highway you've got towns, religious centres, markets and all the other structures and functions associated with those things."

The Big Avebury Pigpen idea is just one of two ideas I'm kicking around at present; the other is that Avebury's circular ditch may have been a form of Neolithic greyhound track with the bank serving as a spectators' platform; unfortunately, the archaeological evidence for stone hares or beech bark betting slips is lacking and therefore considerably hampering my research :-)

* The Ancient World of the Celts. ISBN 0-09-478720-4. pp 108-109.

** Ibid. pp 25.

* Merlin and Wales. ISBN 0-500-51079-2. pp 116.