I read Sticky Church by Larry Osborne a while ago and the idea of the sermon-based small group seemed good. I just recently finished reading this book again and the basic ideas of the book finally sunk in.
If community groups are going to be about community, why spend so much time dithering about curriculum and study topics? Stick with the sermon-based study, and you can spend a lot more time building relationships and supporting one another.
More on this another time.