Nanomedicine

in the future.

Have you tried this:

http://www.futuremedicine.com/loi/nnm

Most I could see, it is still developing. But to seek and destroy cancer cells, etc when first appear would be a great application.

Serious:

The ability to cure patients at the cellular level is truly astounding to even consider. Theoretically, it would be possible for the nanobots to greatly reduce the aging process; by negating/reversing/blocking the impact of oxidation on the human body. There was a show on Discovery channel, I believe, that covered this in pretty good detail.

Not-so-serious:
www.cracked.com/article_15643_p5.html

Hopefully, Woody Harrelson will be around to help fend off the hordes!!!

;)