The netBook mark?
Come off it, I worked for Psion Teklogix when the netBook was in development and even I think that the netBook was poor in comparison to the Series 5. The software was simply not as stable as the earlier hardware's. Of all the people that have even heard of the Psion netBook (as opposed to the practically identical Series 7), I seriously doubt that anyone is in any way thinking that the new generic term 'netbook' trades on the "tremendous commercial value, reputation and goodwill of the Netbook mark"
I also find it speaks volumes that PT themselves can't spell the name correctly with the capitals in the right place - netBook!
Tux because I wish the Psion LX got further than the prototypes!