HP Secrets - An Insider Reveals All (well some)

It's finally confirmed as true - printers sometimes have a little counter inside, so they just stop working after a certain number of prints (very similar to me recently with regard to scraping snow off the driveway - there's only so many times you can do that before you just give in)

These and other juicy details if you follow the link.

14 Hewlett-Packard Company Secrets From A Former Employee - Consumerist