Ask HN: What to cover in a MongoDB case study talk

I'm going to be presenting at the upcoming MongoSF conference on MongoDB with a title "Humongous Data at Server Density: Approaching 1 Billion Documents in MongoDB".

If you were attending this, what would you like to hear talked about?

Database: http://www.mongodb.org Conference: http://mongosf.eventbrite.com/ Reference articles:

"Choosing a non-relational database; why we migrated from MySQL to MongoDB" http://blog.boxedice.com/2009/07/25/choosing-a-non-relational-database-why-we-migrated-from-mysql-to-mongodb/

"Notes from a production MongoDB deployment" http://blog.boxedice.com/2010/02/28/notes-from-a-production-mongodb-deployment/