I once single-handedly developed an entire drag-and-drop ui for creation, provisioning and control of virtual datacenters and all its infrastructure. Other people developed backend and database and the whole project took about 10 months, but about three weeks before we had a working, stable release the company decided to cancel an entire project.
We thoroughly researched the market, and at that time there was no better such solution. We would have made something extraordinary.
Especially because it worked with VMWare.