J2ME

Normally tax agencies are pretty boring, but these folks have been doing very cool stuff. For the last couple of years they've been using a Java tax submission system and are running almost entirely paperless. Their new thing for this year is that they've got a J2ME application that runs on all the cell phones in Brazil (and they have twice as many cellphones in the country as they have households). This app allows folks to submit their tax forms from their cell phone - no computer required. Quite a sophisticated piece of cellphone hacking.

Guru Speaks...