This week is the first time an artist has topped the UK charts without selling a single record. All sales of the excellent Crazy by Gnarls Barkley have been bought as downloads.
The music business is being transformed by digital, but new marketing models are emerging.
UPDATE - Chris Anderson has some interesting data on the Long Tail site - digital downloads seem to be balancing the decline in CD sales
UPDATE - Mobile operator 3 claims that 20% of the sales of this track were through 3. That's pretty astounding.