As part of their bankruptcy filings, Hackintosh maker Psystar declared that they owed Apple $75,000 for something or other.
Computerworld guesses that it's for 581 copies of Leopard that Psytar ordered but didn't get a chance to install on machines, but my guess is that it's one giant copy of Leopard that they custom ordered for the world's largest fake Mac. [Computerworld]