Billing itself as the "world's largest book club", the LibraryThing web site offers a venue to share your latest bibliophilic discoveries. In the History section is a group devoted to SCA folk.
The posts in the forums tend to drift quite a bit, rather than being strictly about books. This is more of a social club for book lovers than a highly focused literary discussion forum. That being said, if you have a love of libraries and their contents and some time on your hands, you may want to check it out.