As the title states, Doom and Double D Dodgeball have been removed from the Xbox live marketplace. I have no idea why Double D Dodgeball was removed but Doom was most likely removed due to Zenimax acquiring ID software and this particular game being published by Activision.
Hopefully Doom will be back in the near future for everyone to enjoy, I know I sure did. I have all 200g in that game, but I’ll stop gloating now. If you already downloaded it, you can still play it and redownload it if you need too.