Well... Isn't it supposed to be PS/2 for the IBM machines?
It's basically black a Sony USB keyboard/mouse with the Playstation 2 logo stamped onto them.

It comes with the GNU compiler targeted for the EE CPU so you can pretty much write what you want. It comes with full documentation on most of the hardware as well. The only documentation that Sony admit not to supplying is for IO processor which handles the peripherals like the CD/DVD drive. Apparently all of the other manuals are what you would get if you bought a proper development kit. It's quite a few hundred pages and it all comes on the DVD as PDF files.

The restriction is that whatever you write is only runnable on another Linux kit. You can't burn it into a CD or anything like that.

- Trevor