Another Hackable Badge Question

NWCCTV

I have been contemplating buying one of the badges to mess with but I have a question. What types of things is everyone doing with them? I do not mean the ones that are using them at expos, etc. just normal everyday hackers. I really do not need anymore "gadgets" as I have several but this looks like one that I "just gotta have" and would like some confirmation.

Andy Lindsay (Parallax)

Virus/rumor spread simulations, a physics experiment toolkit with measurements logged and graphed, fun graphics and video games, badge stuff like exchanging data, and a general conversation starter at events.

I personally didn't expect to have quite so much fun with them, but now, I've become rather fond of the things and recommend getting two. It' a lot more fun with the option of making them exchange data.