3 million Steam activation codes for DIRT 3 have been leaked online today, with confirmation from AMD that the codes were intended for vouchers that were meant to be shipped with Radeon GPUs. A database file containing them was hax0red and leaked online. AMD says:
These activation keys were hosted on a third party fulfillment agency website, http://www.AMD4u.com, and did not reside on AMD's website. Neither the AMD nor Codemasters servers were involved.
I'm sure Steam can just ban the keys anyway, but heck, 3 million keys stolen.