http://bt.xbox-sky.com/ and http://www.blackcats-games.net are quite good but they only open for registration at certain times ( normally a weekend a month) but once your on dload speeds are rapid
No its not on marketplace yet but it is advertised on COD site and Gamespot that the extra maps are out today.. COD game of the year edition is out today aswell.
The Elite has the new 65 micron 'Falcon' Motherboard. It has an extra heatsink on the GPU ( which normally causes the RROD) so it is still possible but far less likely.. COD4 and xbox 250 bargain!