Over the past few weeks I’ve been working with Jean Paoli’s team at Microsoft to create an application that runs across multiple cloud vendors.  Jean’s team has been working on a number of SDKs for PHP and Java, and I wanted to create a sample that demonstrated all of them working together.

The result is a small application that calculates every prime number between 1 and 10,000,000 in a minute or less, with the calculation performed by a set of PHP pages running on Windows Azure, a Java Servlet running on Google AppEngine, and an ASP.NET application running on Amazon EC2.  All of the results are stored in a central SQL Azure database, and I used the .NET Service Bus to coordinate messages across the three cloud applications.

I presented this for the first time at TechEd Europe last week in Berlin and this week at QCon in San Francisco.  Both presentations seemed to strike a chord with the audience, especially the attendees looking for how interoperability works in the cloud.

For those that weren’t able to make it to my sessions, I’ve recorded a short screencast of the demo in action – you can find it here. 

If you are after more information, here you can find a longer (50 minute) screencast that goes into the details of how this works.