At least 80% of my listening is on the run, during commute, and on the computer at work. I have over 1,000 CDs and hardly ever get a chance to listen to them in that form any more. I've ripped about 20% max of my CDs, but I have a merdeload of downloaded mp3s, especially from the early days of emusic, when they had no download limit for the monthly fee. Now I only buy physical CDs if it's a set with additional material I want (like the Miles bootleg set with DVDs) or if it's not available as downloads (I just bought Bud Powell Live in Geneva, but given the sound quality one doesn't really need "hi-def" media. At work I use mostly Spotify, and at home I listen to Pandora a lot, through my stereo system. Still, I can't part with most of my CDs.