Regarding literary discussions, I've run some of those. A key thing that occurs to me is the need to ask specific yet open-ended questions. Variations on "What are your favorites...?" "What caught your attention about...?" and "How are these two things similar or different?" are helpful.

I have discussion questions for all three of my books, and worksheets, and other supporting materials here:
http://penultimateproductions.weebly.com/books-written.html

I love discussing things I've read. I love it when other people talk about my writing, too. One of my readers did this awesome analysis of symbolism in a poem that I wrote:
http://the-vulture.livejournal.com/205402.html