Crackdown is the latest Xbox 360 release to be made available on Xbox Live Games on Demand, as you can see here.
15 quid's the asking price for the excellent Realtime Worlds crime spree and if you're keeping an eye on your hard drive space it weighs in at around 6GB. If you don't already own it, it's definitely worth the download.
The sequel is due on Xbox 360 next year. Read all the known Crackdown 2 details to date now - we demand it. We Games on Demand it.