Martian

An excellent question.

The LHC is going to allow us to experiment with energies that were previously unheard of; in doing so, it's going to allow us to fill in a number of gaps in our knowledge of the physical Universe and how (and why) it works. It's way too early to predict what sort of practical applications will result from this, but it has the potential to change the face of human technology.

Understanding of our Universe eventually begets applications based on the principles learned. This is the basis for all modern technology

To answer your other questions: no, maybe, yes but not in the near future and only if you eat all your vegetables.

EDIT - Further Reading:

http://seedmagazine.com/content/arti...dron_collider/

__________________
I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said

- Ben Harper, Show Me A Little Shame