While reading profiles on BookCrossing I saw an invitation to join the 50 book challenge. Investigated and found that it was a community on LiveJournal and that you had to set up your own account and journal here in order to participate in the community. My main online journal will still be Blogger, with the entries hosted on my server, but we'll see how LiveJournal works. So far, I can't figure out how to post to the community, but I'll do some more research.
Much of the information on what I've been reading will be found at my Reading blog.