Can’t say we didn’t see this one com­ing. Nikki Finke has the scoop on the sales numbers,

I just heard that Warner Bros’ Bat­man Blu-ray discs alone sold 600,000 copies on Tues­day, the first day of release. By con­trast, Marvel/Paramount’s Iron Man sold 250,000 Blu-ray discs when it pre­miered on Sep­tem­ber 30th and ended up sell­ing 400,000 Blu-ray units in its first week. But wait til you see what The Dark Knight sold in both for­mats, stan­dard def and hi-def: 3 mil­lion copies bought by cus­tomers in the U.S., Canada and the UK on its first day in stores. That’s 3x the norm.

Reuters have the lat­est update on the DVD and Blu-ray sales, stat­ing that more than 10 mil­lion units have been shifted:

Sales of the DVD, star­ring Chris­t­ian Bale as Bat­man and the late Heath Ledger as the vil­lain­ous Joker, totaled more than 10 mil­lion units world­wide since its Decem­ber 9 release and are expected to remain strong through­out the hol­i­day sea­son, Time Warner Inc’s Warner Bros movie stu­dio said. Ten mil­lion units trans­late into an esti­mated $175 mil­lion in rev­enues, accord­ing to Home Media Mag­a­zine Mar­ket Research.

The best sell­ing DVD of all time is “Find­ing Nemo” with over 60m units sold.