Over the last few months I've been experimenting with different visualisation suites for a development contact I'm managing at work.
For those that don't know, a visualisation suite is basically a set of controls that mimic (for example) Gauges, LCD readouts etc. Essentially a way to mimic the look and feel of real hardware electronics but on screen. It never ceases to surprise me how many customers ask for this sort of thing, but there is a significant lack of a decent library.
Along my travels, I was speaking to a company called Dundas. These guys are User Interface Geniuses. They have some of the best looking visualisation controls that I have ever come across.
If you ever need anything like this in .Net, I wouldn't hesitate in recommending them. Oh, and check out their charts library too!