Running Debian on a 32MB RAM Single Core ARM SBC
One dream project I have is to build a CM-5 like machine from hundreds of cheap units like this.  Unfortunately this one seems to lack fast I/O.  Could probably do something with the I2C connections but they would be very slow.(Before anyone jumps in with "why don't you use a desktop machine, it'll be faster", this is for fun, not a practical project.)