Double XP weekend for 'Call Of Duty 4'

Call Of Duty 4: Modern Warfare offers multiplayer discounts and online giveaways this weekend.

Starting today, Xbox 360 players receive double experience points as well as half-price maps and the opportunity to play with the development team.

The Variety map pack, featuring four additional maps, will be halved to 400 Microsoft Points. Re-released Prestige gamer pics will also be free to download.

The event ends on Sunday evening, but a similar weekend for PlayStation 3 owners is planned for later this month.