I just mentioned this on our email list (http://lists.jhu.edu, seach for “astrobioclub”): yesterday Greg showed me JournalFire, an online journal club website and suggested we use it for online sharing and discussion of research papers.  I just set up a journal club for us.  If you’re interested, register at the site and join the club.  I just added a bunch of papers from the “hydrogen-eating microbes on titan” controversy.