One other point regarding Netbooks vs E-Readers: The fragility of most netbooks these days.
My early EEE had a flash drive but they all seem to have regular spinning hard disks these days, and that makes me nervous at handling them, which limits my comfort when reading. Although modern disks are more resiliant, they can still easily be crashed if you whizz them around too roughly and that makes me rather more edgy when trying to read on one. With the PRS505 I can just toss it on the bed or clunk it carelessly on the table if I need to get up, and I've even dropped it on the floor more than once - something that I am more likely to do with a netbook, what with its size and general clunkiness- and the PRS is more likely to survive such handling than a PC with a mechanical disk.
With all the other benefits of E-readers (battery life, outdoor reading, small size, beautiful screen) I plump for them for leisure reading anyday.
Course, its all down to preference and taste and I would never expect anyone to follow me blindly. With all the new readers coming out lately it seems I am in a growing minority.
May your eyes never cease
