I use iTunes, it's my anti-drug.
The thing is, I rarely buy CDs anymore, so if the song isn't available on iTunes or I'm currently poorer than than the RIAA claims they're getting, I will use other methods.
Then there's people who have the occasional catchy song, but I refuse to spend money on their CD and support their stupidity and decadence and add to their album sales *cough Britney cough* but she's the rare exception.
Then there's my collection of oldies that you really can't even get on CDs anymore, except maybe in those Time-Life Collections. Most of them I first heard on my parents' records as a child, so unless someone is going to find an inexpensive way to transfer from vinyl to mp3, it's just easier this way. Some of the songs are so ubiquitous that it just doesn't seem like me dling Diana Ross and the Supremes is really hurting the recording industry.
Like a firework unexploded
Wanting life but never
knowing how