The goal was simple: they had 1.5 hours to write "...an app that allows users to rate presentations at a meetup". The coders had no knowledge in advance of the project and it had to "display the names of the presenters, the title of the presentations, some summary and of course, find a way to actually do the rating."
The gist of the competition is that the Windows Phone 7 trounced everyone. Whereas the iOS and Android groups had created one page of the app, the WP7 team created "...a mostly working application with most features implemented". In addition, the Androiders had problems with Compiz (a Linux window manager), which kept crashing.
Overall an interesting story and although real-world developers don't have these constraints, the fact that the WP7 group was able to write a full app so quickly, without even writing any code (they used Expression Blend’s Sample Data feature i.e. mostly drag and drop) is pretty impressive. See previous "coding war" coverage here and here.