Again at our company meeting last week, I saw an awesome demo from of the chaps from the Developer group. They have built the London Underground an application which helps them to manage, maintain and be control of their network with a much richer and user-fiendly graphical interface. They thing that got the WOW was the 3D version of thr tube map which they use to determine the impact on other stations when a certain tube stop has an issue
Richard Godfrey wrote about this more on his blog
The next one I want to get hold of is the BBC application created using Silverlight, so watch this space!