Rally is a fun customer for us - a company making software for companies who make software.  They were listed as a leader in Gartner's 2013 Magic Quadrant for Application Development Life Cycle Management. Their focus is on agile software development, which means their tools have to be fast and responsive - pushing live, actionable information to their users in close to real-time.  Rally uses Datomic to provide that real-time collaboration to their backend storage, while at the same time allowing them to de-couple their architecture from those storages and trade them out as needed.

You can read or download the full case study at http://datomic.com/rallys-story.html.