I'm part of a Bible study group working through the gospel of Mark right now, and I've decided that from time to time I'll post a little tidbit from that study. I've already written a discussion on Jesus' preaching to repent and believe, so that's retroactively now the first post in this series. I have three more already planned, and we've only gotten through Mark 2:13 so far in the study, so this may be a regular feature for a while.
Update: As I go, I'll list and link to all the posts in the series. It will eventually get long, so I'm putting the list in the extended entry.