It went "a while" ago. I thought it must have been something to do with how processor intensive it was.
Best best is to use google with the string inurl:www.themodernantiquarian.com/forum in the search field.

eg http://www.google.co.uk/search?q=inurl:www.themodernantiquarian.com/forum+silbaby&hl=en&lr=&safe=off&filter=0