This is pretty cool. It's a revolving earth that shows in real time who is updating their Twitters, where they are, and what they're saying.
I could imagine big companies using something like this (that would update automatically) to see what's going on at each of their offices all over the world at any given time. Or a company like Starbucks could set something like this up and customize it based on what kind of drink someone buys. So they could have it show them who all is buying an orange mocha frappachino at any given time all over the world--not sure why people waste money on those expensive drinks but you get my point.
Personally, I'd like to see a mashup of this with sports scores all over the world. Or wave reports for surfing. The possibilities are endless....