I know it will sound like I'm B'sing and normally i'd say seeing into the future is a stupid idea but i have (for lack of a better way of putting it, seen the future, never anything important or remotely significant)
For example this song:
http://www.youtube.com/watch?v=eQGU-vdXoVE
featured in a dream i had about a year before it was actually released, I've never even liked kylie minogue!
Ive also dreamed about being in a room that i had never been in previously, 3 months or so later i was there to see mission impossible 4, it turned out it was the lobby to an IMAX.
There are other odd bits in my life where i'll get deja-vu yet will have never seen or been to these places or met these people prior.