The One Laptop Per Child effort has a big pile of prototype systems, and
they are looking for developers who would like to use them to help with
OLPC development. Note the limits of these prototype systems: they are
bare circuit boards with a power supply and a connector for a serial
console. But, if you would like to play with such a system and help make
it work better, the OLPC project may send you one. Have a look at the OLPC
developer's program page for information on the systems, a list of
tasks that need doing, and instructions on applying for a system.
LWN