Slashdot reports that Radiohead did okay with their stunt to let customers set their own price for their In Rainbows album (quote from Comscore):

"During the first 29 days of October, 1.2 million people worldwide visited the 'In Rainbows' site, with a significant percentage of visitors ultimately downloading the album. The study showed that 38 percent of global downloaders of the album willingly paid to do so, with the remaining 62 percent choosing to pay nothing... Of those who were willing to pay, the largest percentage (17 percent) paid less than $4. However, a significant percentage (12 percent) were willing to pay between $8-$12, or approximately the cost to download a typical album via iTunes, and these consumers accounted for more than half (52 percent) of all sales in dollars."