And make sure the prices are right. $.99 is pushing it for a .mp3 even at 256k (we need more lossless DRM-free files), and $1.99 is way too much for a single episode of a TV show that I can DVR for free OTA or included in my normal cable bill. Plus, since it's a P2P format, that means I'm paying a large part of the distribution cost, so it better be dirt cheap.
As far as artists and labels claiming that P2P lowers the value of the product and makes it a "commodity" - well, the way it's marketed long ago made it a commodity, and the proliferation of new, usually pathetic "artists" lowers the value. The more there is to choose from, the less perceived value any one item has. Plus, all the crappy CDs release over the last 15 years have scared away many consumers.
Plus, the $3.99 bargain bin ("cut-out") CDs have been around since before P2P. Why buy a new CD for $15.99 now (they were $12.99 when I got my first player back in '86, with a promise that as R&D costs were recouped, the price would drop dramatically) when it will be available cut-out or used for less than $5 in a year or two? Plus, there's a lot more competition these days for people's "disposable" income.