Radiohead D-Day

As promised, with only about a week's notice, Radiohead just officially released their new album straight to the internet, for free. And it's pretty good, too. This will do nothing but help bands like Radiohead. This will do nothing but hurt acts like, say, Madonna. And it will make absolutely no difference to 90% of the rest of the major label acts on the planet, who make a relative pittance from record sales, anyway.

Some questions: how will this affect indie acts, who do make some cash on CD sales? Also, is this album still copywritten? Even though it's free, is it legal to trade?