MongoDB is playing a critical role in new initiatives at Coupons, Inc. For new initiatives MongoDb is our primary database. We use it for wide variety of cases. including real time site statistics for business development, and primary backend for coupon codes Content Management system. We would like to talk about our experience with MongoDB. What things worked for us: ease of data modeling, rapid prototyping, scaling etc. And the things that we felt would have helped us in migration, and in our future projects e.g. integration with solr, features in php client, better join support(when we need it!).