Here's a talk by ex-Flurry Marketing VP Peter Farago that could interest those of us who want to get more engaged users.
http://www.eventbrite.com/e/best-practices-for-lean-user-acquisition-and-engagement-tickets-11013470587
http://www.eventbrite.com/e/best-practices-for-lean-user-acquisition-and-engagement-tickets-11013470587