There are companies like this one:

http://news.bbc.co.uk/2/hi/entertainment/7213112.stm

that are trying to set up free legal download sites for millions of songs from major labels. They say they will get the liscensing fees back from ad revenue.

Do you think that's a good trade? Or would you resent the spyware and pop-ups and do everything you could to take the music for free anyway and screw them out of thier ad revenue?