Update: To clarify, the Legendary playlists within Halo 3 now require all downloadable content. So to continue playing on Legendary playlists you'll need the free Heroic pack, the Legendary pack (which you'd need to play on that list anyway) and Cold Storage. After Bungie Day the playlists that utilize Cold Storage are playlists that require all downloadable content. Effectively making Cold Storage apart of the Legendary Map Pack after today.
Good morning ladies and gentlemen and a good Bungie Day to you. To help celebrate this, surely soon-to-be National, holiday the Xbox Live Marketplace has been overrun by Bungie related content. Available for download are a free gamer picture set and dashboard theme, both wrapped in Bungie-branded love. Also, if you're interested, 'Cold Storage' -- the new map for Halo 3 that re-envisions Halo's 'Chill Out' -- is online for the low price of free.
Don't have the Heroic or Legendary Halo 3 map packs? Heroic is still available for free and as of today the Legendary map pack has been discounted to 600 MS Points. Oh and also, we're offering 10 X3F bonus points (which don't mean anything) to the first person to spot any Superintendent related hints in the map. Happy hunting!