If I ever download a piece of music that I would have bought, I will send a check. For example, I have downloaded several videos from Pink Floyd's Pulse. I have alse checked the video store every month for two years for dvd availability. I also used to own it on laserdisc before it got thrown in the trash over a divorce.
I feel no guilt downloading any of those videos or the mp3's. None whatsoever.
With me, it was my mother throwing out my collection of vintage baseball cards. I'd be richer than Croesus right now if I still had a few of the rookie cards (Sandy Koufax and several others) in that collection and were to put them up for sale.