I know that is what Jeff Tucker is trying to do over at Laissez Faire Books. They release EPUBs once every two weeks (recently changed from once a week), and there are forums there where people can discuss the books (I am not a part of LFB Book Club so I don’t know the details):
I also know that over at LibertyHQ, a reading group recently started up for MES (there are three parts so far, I have linked to the first part):
http://libertyhq.freeforums.org/mes-reading-group-ch-1-t72.html
If you are going to be reading books, please mark down any typos you find, and report them in this “Book Typos” thread, it would help greatly: