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Thorf's Mystara Logoby Thorfinn Tait
The main logo you see around, with the gold trim and embossed lettering, is a Photoshop file, and not all that high resolution at that — about 1,600 pixels across I think. (I made it in 2006, at which point that seemed like more than enough.)
The original design behind that is an Illustrator file, though, and therefore scalable to any size.