Perusing through Retro Future you can find many of the ideas and items that were promised to the person of the future (circa 2000a.d.) way back when, and get an update of where we are with that idea. For example:
* Food Pills - just pop one in and you're good to go
* More Leisure Time than we Know What to do with (who was that genius?)
* Rocket Mail
* Moon Vacations
* Two-way Wrist Radios
* Smell-O-Vision
I wonder what will happen to the idea of PDA chips in our heads? I'll check out this site in 30 years.