Some fun quotes:
The “Reckoner” that was part of the band’s live sets sounds nothing like the “Reckoner” on the album, which includes the lyrics “in rainbows.” When the band returned from touring, it decided the song needed a second part, and then a third one; eventually it discarded the original.
[…]
Mr. Hufford said that he and Bryce Edge, Radiohead’s other manager, had come up with the pay-what-you-want plan during a stoned philosophical conversation about the value of music.
[…]
The music business awaits results on how the worldwide downloads of “In Rainbows” will affect disc sales. “The record company doesn’t know,” said a grinning Colin Greenwood, Radiohead’s bassist, over tea in London. “They called our office and said, ‘We’ve made this amount of records, is it enough?’ And our manager’s office said, ‘I don’t know.’ It’s great, isn’t it?”
[From Radiohead – In Rainbows – Music – New York Times]