[reagan_fanatic]

Not sure exactly when they became a common consumer item, but I’d say the GPS.

I own a Garmin, and I just love it. I don’t know what I’d do without one.

[Jedidah]

Ditto.

[freespirited]

GPS gets my vote too. Honorable mention to the all-in-one printer/scanner/faxer/copier.