Last month, they challenged Apple's claim to the copyright of Mac OS X, claiming that Apple never registered Mac OS X with the U.S. Copyright Office.
Previously, Judge William Alsup had dismissed federal antitrust claims, which only prompted Psystar to amend its countersuit with all new claims.
Now, they're trying yet another angle. Psystar is claiming the first sale doctrine. Similar to the right you have to buy a book and re-sell it, Psystar says that since they bought legit, retail copies of Mac OS X from Apple and installed them on their computers, they're in the clear. If they want to then sell those computers, that's fine and dandy. Unfortunately for them, they also bought shrinkwrap EULA's which impose license conditions. They don't "own" the software.
Everything else aside, this seems like an awful amount of time, effort and expense just to sell computers. There are less difficult ways to sell Mac OS computers, folks. At this point, you're just being stubborn, Psystar. Let it go.
Back in April, Psystar went public with the first commercial Hackintosh clones. For US$554, they'd send you a Core 2 Duo minitower with Mac OS X pre-installed. In June, they released rack-mount servers with Leopard Server pre-installed in both 1U (starting $1599) and 2U (starting $1999) configurations.
Update: It seems that Psystar has included claims to the first sale doctrine, as some of our readers have pointed out, for a while now. However, we don't feel that it's a "linchpin" of the case -- first-sale hasn't been rejected by the court. More on this seemingly unending story as it develops. Thanks to Alex at World of Apple for the heads-up.