I can't remember the last time I bought a CD. In fact, I sold my entire collection on the cheap to some friends and then dumped the rest to an online auction. I just had no use for them anymore and didn't want to lug them around. I moved with them twice and never took them out of the shipping container.
@sharkethic: That's super weird. It sets a pretty bad precedent for people buying games, if they have to second guess weather a game is gonna be even cheaper later on. You would think that Valve would try to avoid that and just feed the buying frenzy as much as possible.