Well not exactly an espresso, but this is something you should check out. I am a fan of Kickstarter, the start-up micro-fnding site, and came across the Jiva cube offer. Here's the concept - need a quick offer anytime, anywhere (who doesn't?), drop a Jiva Cube in the cup, add hot water and go.
the Cubes are made of Colombian coffee and a form of sugar, called Panela, a whole sugar that helps hold the Jiva cubes together. I like the innovative spirit.
If you want to check out the food category over at Kickstarter, you'll see some of the mix if ideas needing a little capital. They range from micro coffee roasters, to cafes and beyond coffee like Food Trucks, and You-Brew start-ups.
At Kickstarter - Jiva Coffee Cubes