I don't know what the maximum length of a WikiAnswers post is, but I guarantee that a complete listing of all NASA spinoffs would be longer.
Just the highlights, you say? OK.
- Computers.
- Weather forecasting using satellite photos. Remember that before satellites, hurricanes used to hit the coast with hardly any warning at all.
- Medical sensor technology.
- Cell phones
- GPS.
- Decent maps.
- Long-distance telephone calls.
- Live coast-to-coast television
- Overseas live TV