Some of the pros and cons for the re-erection of the fallen/buried stones at Avebury were discussed here back in April - http://heritageaction.wordpress.com/2009/04/15/aveburys-restoration-and-the-stukeley-line/
Mike Pitts is now, "...planning to lead a community project at Avebury that he proposed some years ago but which is still in at the drawing board stage to get villagers to re-erect one of the megaliths in the main stone circle that fell over in the 18th century.
"Mr Pitts said he was also hoping to lead a search for the quarries or pits from which the Avebury sarsen stones were originally excavated more than 4,000 years ago. The stones were left by the retreating glaciers but would have had to be excavated, he said.
“Nobody has ever looked for them but we are hoping to find them,” he said."