Larry Osborne has written several books that have been insightful, encouraging and challenging. You can find a link to Sticky Church here and Sticky Team here. 10 Dumb Things Smart Christians Believe is another book I’d recommend you reading but in the meantime here’s a quick summary from Leaders Book Summaries, a website that offers summaries of, for the most part, leadership books (for only $5.95/month).
Click here for a summary of Osborne’s book 10 Dumb Things Smart Christians Believe.
Theology Along the Way 
Given your Reformed bent, what’s your take on Osborne’s #4 and #6? (I’ve just read the summary, not the actual book).