Cover CD from British 'metal' magazine Kerrang! - a whole load of alternative/rock/metal. The bias on this CD seems to be towards progressive/experimental metal - although most of it is still fairly accessible (altho heavy).
Most of the tracks are from this year - a few from 2008, including bands from the Kerrang! 2008 summer tours.
Was free on the cover of Wednesday 8th July's Kerrang!