MySQL Conference 2011 -- The Secret Sauce of Sharding -- Ryan Thiessen
Storing eBay's Media Metadata on MongoDB, by Yuri Finkelstein, Architect, eBay
Superficial mongo db
I have a good shard key now what - Advanced Sharding
Webinar: Operational Best Practices
Sharding Methods for MongoDB
Sharding - patterns & antipatterns, Константин Осипов, Алексей Рыбак
