Very nice! How did you do it?
That's good. But I don't think the code is really using 100% of the CPU in the normal sense of the idea. The CPU is always running at 100% - it's just running the main loop code over and over - it's not a infinite length blocking call or anything like that. If you put something in your main loop to read the pot you will be fine, it will probably be reading that pot a few thousand times a second.
What is that blue box anyway, is that a fancy despiking cap? I don't have any that look like a blue box, that is new to me.
would you be able to give us link to the ebay page you bought the programmer at?
http://hackaday.com/2012/08/13/teensy-tiny-arduino-board-with-an-attiny85/I've been thinking about trying some of these, They are the same thing you are doing, but in a nice little package.After you've programmed it, you cold cut off the tab and and make it even smaller.
It looks like you may be able to use that board in a usb slot (similar to the one I posted), you may need trim down the sides a little, but it looks like it may plug right into USB.
someone made a neat LED matrix stamp for the digispark, I thought it was pretty neat also