I made up the Creative Commons double-c colophon in EPS and PDF formats. I spent ages trying to figure out the font: it’s Berthold Akzidenz-Grotesk (Bold), a precursor to Helvetica and other modern sans fonts. The crucial detail was how the ends of the “c” terminated. In Akzidenz-Grotesk, they are sliced off on a diagonal. Other, more common, sans serif fonts slice them off either vertically or horizontally.
cc colophon (EPS) cc colophon (PDF)
UPDATE: Well, CC does not license the use of the Circle-CC symbol for any use other than to point back to their web page. I got a nice email from their general counsel pointing me to their presskit, which includes EPS and other vector-format logos. Oh, and if you are able to open any of the files on their press kit page, do drop me a line: I am unable to display any of the EPS files, and I cannot open their font suitcase. Bah.