Hi,
Yeah I have seen it before. You see I was interested in OS coding a while back. Now I am not much interested but may continue soon. I have also coded my own OS. It is not GUI or anything. It is 32-bit has a command line interface, has a minimal FDD driver and a FAT12 driver. It can read and display the contents of a text file in the FDD. It doesn't even need a whople floppy. The whole kernel is ~ 10kB. You can see it at http://www.tomasm.tk/
See the OSDev page. I have also made a 16-bit OS that fits into the bootsector of a floppy i.e 512 bytes

Thomas