No, actually, they will. Bill at Spare the Rock tells the story of They Might Be Giants wanting to record a song for his broadcast. That is beyond cool, that's like, I don't Bill-and-Ella Lee Supertaster-cool, or something.
And in other They Might Be Giants news, their Dial-A-Song website has been relaunched with news that they're recording "adults" and "kids" albums back-to-back, with both albums scheduled for release in 2007. No "Here Come the 1-2-3s," as has been rumored, in 2006, I guess. (Thanks to the good people at This Might Be A Wiki for the heads up.)