Details regarding sales of Radiohead "In Rainbows" were released at the “You Are in Control” conference in Iceland, including the fact that the album has sold more than 3 million worldwide.
Warner Chappell’s Head of Business Affairs Jane Dyball delivered the keynote address and noted, among other things, that the digital publishing income from just the first license (for the Radiohead pay what you want site) dwarfed all the band’s previous digital publishing income.
OTHER STATS
• The physical CD has sold 1.75 million to date.
• 100,000 boxsets have been sold via W.A.S.T.E.
• Nearing 17 million plays on last.fm
• 1.2 million fans will see the tour
• The digital income from the experiment made a material difference to Warner Chappell’s U.K. digital revenue this year

Music :) Ally has details; Pitchfork has its own take.