GameSpot - Add-on PlayStation 3 HDD will run Linux:
"Linux is legacy, but it will be a start. In the case of the Cell, operation systems are applications. The kernel will be running on the Cell, and multiple OSes will be running on top of that as applications. Of course, the PS3 can run Linux. If Linux can run, so can Lindows. Other PC Operating Systems can run too, such as Windows and Tiger (Max OS X 10.4), if the publishers want [them] to do so. Maybe a new OS might come out."
Via OS News
