Having made many boards like this for various MCUs, the answer is... not much. There is very little you can do with a board this size other than experiment with the MCU's internal capabilities (or use it on a solderless breadboard to try things, although the pinout isn't ideal for that either), but for any real project you'd need to add more electronics to it anyway. If you can build this board (it's not pre-assembled, and you have to fab your own pcb's too), you can build a custom board that's better suited to your needs. And just to be clear - this board will not run Linux. Don't get me wrong, I'm a big fan of DIY electronics (anyone who knows me is saying "duh" about now ;) but it doesn't help if people get too high expectations for cheap dev boards. If you want to learn a little electronics and play with an ARM MCU, this looks like a great project, but if you want something more "ready to go with Linux", this isn't it.