Top ten things I forgot to pack (I mean buy) and have figured out by now I probably need:

10. Pair of scissors
9. Calculator
8. Envelopes and stamps
7. Stapler
6. Wireless ethernet cards and hub :)
5. Compass (Or at least a better sense of direction...)
4. Laundry detergent, fabric softener, and dryer sheets
3. Automatic robot bed-maker, bathroom-cleaner and floor-vacuumer
2. Food
1. Grade inflator