What's a Due do?

So,

My lovely wife got me a Due for Christmas. Now I'm trying to think o what to do with it. Has anyone done any neat experiments with this thing that take advantage of or demonstrate it's capabilities?

A Due does about 84MHz.

Sorry couldn't resist ;) I don't have a Due yet, sort of waiting to hear what other folks are doing, so will be interested to see responses.

Massimo Banzi gave a great introduction to it at Maker Faire NYC this year. The entire talk is here:

http://www.youtube.com/watch?v=4TZQt9lTAOU

You might want to check out this part of the forum: http://arduino.cc/forum/index.php/board,87.0.html