Whatever they wish to, within the limits of the PS3 hardware.<p>While the PS3 supports linux, it is run under a hypervisor which restricts its access to the RSX 'Reality Synthesizer,' the graphics processing unit (GPU).  The Wikipedia entry also notes that "support for the "Other OS" install option was removed by Sony in the PS3 Slim."<p>References:<p>* <a href="http://en.wikipedia.org/wiki/Linux_on_the_PlayStation_3" rel="nofollow">http://en.wikipedia.org/wiki/Linux_on_the_PlayStation_3</a><p>* <a href="http://en.wikipedia.org/wiki/RSX_Reality_Synthesizer" rel="nofollow">http://en.wikipedia.org/wiki/RSX_Reality_Synthesizer</a>