Considering that MonoGame was one of the first frameworks that allowed you to release your games on Windows 8 and Window Phone 8, even ahead of Unity3D, I'm disappointed it wasn't given more air time, or that any demos of it running on Windows were shown.
Also you neglected to mention 2 of the biggest XNA games that were ported to other platforms using MonoGame, namely Bastion, from Supergiant Games, and Fez by Polytron Corporation!
The speaker did not point out that MonoGame allows you to port your XNA game to iOS, Android, MacOS, Linux and as he mentioned Windows 8. Soon we will support Windows Phone 8, PlayStation Mobile and even Raspberry Pi.
To actually start using MonoTouch or Mono For Android, costs you nothing as the trial version, which works with the respective simulator/emulators, is FREE. Only once you are ready to test on an actual device do you then need to pay $400. Xamarin have special offers through out the year too, so look out for those as well.
MonoGame will be adding ES 2.0 ( shaders, programmable pipeline etc) and 3D support in the new year, and we hope to support PlayStation Suite ( PS3, PS Vita and Sony Tablet and Other Sony certified devices ), when PS Suite ships, hopefully some time in 2012.