IBM has put up a great commercial on smarter planet.
We also mentioned about this last week when we talked about information processing helped by information technology, using an example on traffic management. The following video nicely demonstrate this.
For us IS/IT people, smarter planet means smarter information processing, with the help of computer technology. You can try identifing the three (or five) components in any of these smarter planet systems.
View more IBM's ideas here http://www.youtube.com/user/IBMAdvertising and http://www.ibm.com/smarterplanet/us/en/. Do you have more good ideas on where we can use a smarter system?