My fave's would have to be a mix of trance and metal.
Tiesto - Parade of the Athletes
(if the olympians can use it at their opening ceremony, it's great for my lazy ass)
Anything by Above & Beyond or Van Buuren.
For single tracks I'd go with:
Goldenscan - Halcyon
Lagoona - Into My Dream (I think that's the name)
Karen Overton - Your Loving Arms (club mix)
Fable - Above
and the last track I'm trying to think of seems to be evading my thoughts... lol.
I'll check my iPod in a bit.
Metal... well this is easy.
As I Lay Dying
Trivium (old not new)
Lamb of God
Unearth
Every Time I Die
not really metal but Story of the Year
All That Remains
Have fun!
Guess who's back... tell some men.