Vote For a Radiohead Encore, as reported before, offers professionally recorded CDs of live concerts (think along the lines of what Pearl Jam did a few years back). They currently have a poll up to see who should be their next series, and Radiohead is one of the possibilities. Not sure how binding this is, as they seemed to have pretty much missed the boat on this tour, but you may as well head on over and vote for them anyway.
They’re neck and neck with Yes, of all bands.