According to this SlashDot report, FreeBSD, the Unix-based free operating system, now runs on PS3 - according to comments from FreeBSD's Nathan Whitehorn. While an earlier report indicated that this was made possible by the recent release of the PS3 cryptography key, the OS was run via a netboot ( remote booting a computer over an IP network without access to a hard disk).
Here is what Whitehorn said on FreeBSD.org:
"Yesterday [January 6], I imported support for the Sony PlayStation 3 into our 64-bit PowerPC port, expanding our game console support into the current generation. There are still a few rough edges due to missing hardware support, but the machine boots and runs FreeBSD stably. These rough edges should be smoothed out in time for the 9.0 release."
He used Sony PlayStation 3 Fat and firmware version 3.21.
Find out more details here.