I am part of a team (along with Bruce Stringer and Jason Swindle) working on an internal application called Graffiti, which provides an easy way for front-line Rackers to record interactions with customers and provide valuable data with each interaction. It also creates a much simpler way for leads to be passed from the front line to the IB sales team here in SMB cloud.
We knew from the start that we wanted this to be an agile cloud application that utilizes all the things a cloud should be. We had some limitations which meant we had to home grow a few solutions. Since this is an internal application, we could not rely on third-party solutions for off loading workloads. We also had to be careful with our security practices, of course. We ended up going with a configuration that utilizes our internal nova solution for hosting in Cloud Servers. The downside to this is that we have no automated backups, no load balancers and no Cloud Files - much to my dismay.