Yes, and they've also appeared in two or three brief musical video clips with the Homestar puppet singing lead.
This isn't the first collaboration with pop pros that Homestar Runner has done, either; wasn't DaVinci's Notebook involved in making "The Ballad of the Sneak"?
I do not know, but this is only the second time I've heard of DaVinci's Notebook, the first being where they apparently collaborated with Moxy Fruvous on a cover of "Shoehorn with Teeth" that I found on KaZaA a while ago.
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This isn't the first collaboration with pop pros that Homestar Runner has done, either; wasn't DaVinci's Notebook involved in making "The Ballad of the Sneak"?
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*DRAMATIC STING*
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Google says yes (http://www.homestarrunner.com/sneakvideo.html); note the title bar.