If you happened to see the new announcement on the Rock Band forums today, then you would know that Harmonix/MTV games is releasing 5 more songs as DLC this christmas. All this downloadable content makes me happy. Rock band is really sticking to their word about releasing a lot of content. They is something for everyone this christmas now.
Hey all,

"Hope you are having some good time off or will be soon. Below is the press release for tomorrow's DLC. As mentioned before the DLC will come out on Xbox marketplace on Tuesday and on Playstation store next week (along with next week's regularly scheduled DLC) due to Sony's offices being closed this week for the holidays. At any rate enjoy the DLC and I'll be back later this week!

Happy holidays,
Sean
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Harmonix and MTV Games want you to ring in the holiday cheer with a special Rock Band gift. For a limited time, fans and gamers can purchase tracks from platinum-plus-selling rock act 30 Seconds To Mars, pop-punkers All-American Rejects and Swedish new-wavers The Sounds at a special holiday price of $0.99 per song (80 Microsoft Points per track for Xbox 360).

Starting tomorrow, there will be a total of five new songs available.
They are:
"Attack" - 30 Seconds To Mars (from 2005's A Beautiful Lie)
"The Kill" - 30 Seconds To Mars (from 2005's A Beautiful Lie)
"Dirty Little Secret" - All-American Rejects (from 2005's Move Along)
"Move Along" - All-American Rejects (from 2005's Move Along)
"Song With A Mission" - The Sounds (from 2006's Dying To Say This To You) "