What/who is Psystar and why are they suing Apple?
You can read the past threads and find out for yourself. Short version: Psystar is a Florida-based company that’s selling generic PCs with Mac OS X preinstalled. Apple is suing them to stop this practice, as they are not an authorized reseller. Psystar contends that they make legit volume purchases of OS X and so are authorized to do whatever they want with it.
Apple is suing Psystar for copyright infringement for installing and selling copies of OSX and other Apple intellectual properties on Psystar computers in violation of Apple's End User Licensing Agreements. Psystar is counter suing claiming first that Apple is illegally using it's monopoly position in the "Mac OSX Computer Market" to prevent other makers selling Mac OSX computers which the judge threw out as ludicrous; and now claiming that Apple is abusing its copyright by limiting who can sell OSX computers with OSX installed.
Several months ago, Psystar filed bankruptcy and put the lawsuits on hold but when the bankruptcy judge ruled that the bankruptcy could not proceed until the lawsuits were completed, Psystar switched lawyers ( their original ones were creditors being denied payment in the bankruptcy) and dropped the bankruptcy, showing that it was merely a delaying tactic to avoid answering Apple's interogatories. The judge also ruled they cannot ever use a bankruptcy again to delay a lawsuit with Apple. The judge was not happy with them!