Courtesy of Joey Reiman for Pink Magazine, published in 2005:

1. Thou shalt not take the BlackBerry to any table with food on it or family around it. A BlackBerry is not a fruit, nor does it come from a tree.
2. Thou shalt not use the BlackBerry as reading material in the event of insomnia. It will only worsen your situation.
3. Thou shalt not BlackBerry in lieu of responding to a child’s request (e.g., “Wait a second, I’m reading something.”).
4. Thou shalt not place the BlackBerry within distance of hearing its incessant beeps while at home. It is not a bird.
5. Thou shalt not check BlackBerry as if it were your baby. It will not cry or stop breathing.
6. Thou shalt not confuse number of e-mails with self-worth.
7. Thou shalt do everything possible to misplace your BlackBerry on weekends.
8. Thou shalt remember that a BlackBerry is not a body appendage. It is a device that belongs in your briefcase or on your desk, and not in social settings.
9. Thou shalt refrain from bringing the BlackBerry to events involving family interaction. Extraneous dialogue with this contraption in lieu of real conversation suggests addiction.
10. Thou shalt never, ever, ever bring the BlackBerry to bed.

Since canceling my data plan last year, I haven’t broken any of these. (Thanks, Josh)