Recently some new Ubuntu builds have been made available for PS3 Linux. Although Ubuntu does not officially support it, the PS3 versions are maintained through community support.
PlayStation 3 Desktop CD: For Sony PlayStation 3 systems. (This defaults to installing Ubuntu permanently, since there is usually not enough memory to try out the full desktop system and run the installer at the same time. An alternative boot option to try Ubuntu without changing your computer is available.)
Download: Ubuntu 9.04 (Jaunty Jackalope) PS3 CD (684MB) / Ubuntu 9.10 (Karmic Koala) PS3 CD (644MB)
Those interested in keeping up on the daily builds can check the link above or HERE, and props to both xmen3 and mihaiolimpiu for the news.
More PlayStation 3 News...