Do you have a Zune HD?
If you do, you may want to check out my latest App: Particle Field.
It is a very simple program that allows you to simulate thousands of color changing particles at the same time. You can control them with your fingers (it supports multitouch) and also alter the gravity by flipping your Zune. Since gravity is decided based entirly on your zunes accelerometer you can play at any angle you want!
This program is rather amusing, I personally have spent far more time playing with it than I have making it. Earlier today, I released the official version of Particle Field, some screenshots may be seen above.
I am looking for any advice that you can offer.
Also, this project is entirly Open Source. If you know some C# or want to get started. Than feel free to open this up and play around with it. The full download contains all code and graphics used in the program. Unfortunatly I have no camera and there is no way to take a video of the Zunes screen without one, this means that you will have to look at the pictures I provided above as proof of what this app looks like. Trust me, it is far more impressive on the Zune.
The link will take you to Zune Boards, which offers some of the best apps for the Zune. The downloads are located at the top of the page.
Questions, Comments? Please post them below. I try to answer every question I get.