My Kindle 3G just gave up the ghost after two years and I'm looking to replace it with something will last at least for 4-6 years. Some other things I would consider for buying an reader:
- E-ink Screen
- Responsiveness - how responsive is it, my Kindle can be quite unresponsive at times but bearable when it comes to indexing.
- Stability - does it crash? how often? I don't like the fact that my Kindle crashed at least once a month even when it was brand new.
- Book Organization - I hated Kindle's collections interface, I preferred organization by folders.
- PDF loading - nice to have but not necessary since I'm thinking of buying a tablet for this feature or just using my phone
EDIT: If anyone has a functioning e-reader above 2 years I'd definitely be interested to hear about it. I've been reading the forums for e-readers but I haven't seen anything about age of e-readers.