Continuing with the Daily Deals on Games for Windows LIVE, today's offer is:

Prototype - £19.99 £9.99 or $29.99 $14.99

New York in the near future. You are the PROTOTYPE. Armed with amazing shapeshifting abilities, hunt your way to the heart of the conspiracy which created you. Then make those responsible pay!
Unfortunately, no achievements for this one! But if this one's for you, you can download it here.