My brother and his partner used to run the Kent in Kaos site but with two children it got a bit much to keep it going.
They still have the pictures (which he took) and all the information which i got from the library from him (i work in a library so that was handy) so if i ask him nicely i'm sure i could put some of his pics and info on here.
Unfortunatly the one site that had info on the Medway Megaliths with plans is also defunct.
This site has some info:
http://www.nationaltrail.co.uk/Northdowns/article.asp?PageId=3&ArticleId=7
Also this book,The Medway Megaliths by Brian Philp is very good,with plans,history and archaeology.
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