This is so neat, as Phil mentioned in the How to run a software bookclub post, out of a group of 500, only 1-2%, 5-10 people may contribute with comments. But he lets the group grow in size because it is minimal overhead and many "lurkers" say they really appreciate reading the comments and get a lot out of it.

I am left wondering is there any way to see past comments on book discussions? I would love to read the discussions as I go through a book already done by the club on my own.