I never leave home without mine. Especially if i'm headed to the gym. My playlist usually depends on who has synced their iPod with my itunes and wiped my songs.. This is what it looks like at the moment
Lamb of God
As I Lay Dying
The Butterfly Effect
Korn
David Bowie
Cold Chisel
Bruce Springsteen
Guns n Roses
Vanilla Ice
Marky Mark
U2