When venturing into the city or going to a crowded event such as a museum, convention, theme park, mall, or any place involving a parking garage, it is often hard to find an open parking spot and people have to drive extra slow just try to search around for a spot. I recommend implementing parking spot indicators above spots that show a red or green light and a central monitor that is displayed when entering the garage so people know where the free spots are from the beginning.
I'd be interested to see small devices which can be attached to gadgets such as cell phones, glasses, keys, etc. Then there can also be a remote which can track these "stickers" placed on the objects using GPS to find their locations. This would greatly help people who have trouble remembering where they place things as well as those who have a lot to keep track of.
It would be great if the iPhone or other great smart phones could connect to a wireless printer and print to it. We can view documents on the iPhone but we are limited in viewing them on screen. Maybe there is an app that does this? Anyway, it would be great if we could make a free one.