Ok, here´s my final entry!
At first I want to say, the starting of the avalanche and the dynamic of the house-fragments (I forgot to reactivate a spin) are really out of the question. I hadn´t the time to tweak more on that. I made only one testrendering of the animation, the second animation rendering is the final :hmm:
I started in week two of the challenge I think. After 5 or 6 days of testing and tweaking in 3ds max 6 I started the final render. Everything is very low poly as you can see when you look at the trees. They are just a rendered AEC-Tree, mapped on three planes, each at 60 degrees rotated. The rendering was done on a single AMD CPU. At first I wanted to render at 640x320 but the time was too short. It was even not enough to finish the rendering of the current smaller resolution so it stops too early :sad:
For the rule-based particle dynamics I used thinking particles 2.0 . When the particles of the avalanche hit a tree it gets cut down. That´s it. The volumetrics came from pyrocluster 3.0. Here is also still some tweaking needed.
There´s nothing more special to say about it. If you have some questions, feel free to ask here or write me an email 
Here are some images of the animation. The link to the final animation is below the image.

Download the animation HERE
Quicktime 400x300 approx 7 MB + sound
Thanks to CGTalk! It was a lot of fun to take part in this challenge :buttrock:
I hope I didn´t brake any of the rules.
André