Originally, Palm identified the Pre to iTunes as an iPod made by Palm. This caused Apple to release iTunes 8.2.1 an update which checked the Vender ID to make sure the connected device was manufactured by Apple.
Unbelievably, Palm has now spoofed Apple's USB Vender ID to re-enable iTunes sync for the Palm Pre. This behavior is specifically against the rules for use of USB.
Unauthorized use of assigned or unassigned USB Vendor ID Numbers and associated Product ID Numbers are strictly prohibited.
If that wasn't questionable enough, the company also filed a complaint with the USB Implementers Forum saying that Apple's blocking of the Palm Vender ID constitutes improper use.
Palm believes that openness and interoperability offer better experiences for users by allowing them the freedom to use the content they own without interference across devices and services, so on behalf of consumers, we have notified the USB Implementers Forum [USB-IF] of what we believe is improper use of the Vendor ID number by another member."
It seems that Palm believes a lawsuit from Apple will help its publicity.