The Call of Duty: Black Ops "Escalation" DLC is available now on Xbox 360 for 1200 Microsoft Points ($15). The pack contains five new maps and ... wait, wait, this totally deserves its own paragraph.
And: "Call of the Dead". It's a new zombie mode map featuring Sarah Michelle Gellar (Buffy: The Vampire Slayer), Robert "Freddy Krueger" Englund, the ever-present Danny Trejo (Machete) and The Walking Dead's Michael Rooker -- oh yeah, and an undead George Romero.