I don't know if this rumor has any basis, but if it does, it's going to be painful for Sony - they'll have to pull all the PS2's with the dual shock controllers:

Reports are trickling through this evening that Sony has indeed lost its patent case against Immersion technologies and will be forced to halt sales of its PS2 console.

Immersion last year sued Sony for infringing on its patents. Immersion claims that it owns the technology that powers the rumble in Sony's Dual Shock controllers. It also sued Microsoft for its rumble features in the Xbox, but the boys from Redmond settled out of court.

Could be some interesting times in the console world if this one pans out.