Pay for games.. whaaa?
Being able to not worry about the CD is great at times.
Like with UT.. It's tucked away in a binder and I"m glad I can just be spontaneous and fire it up.
Games like Grim fandango though, there's movies and voices.. music as well. Crap, the whole game takes up 40 megs on the HDD, so it's running totally off the CD, but there's enough to warrant it.
I'd second gamecopy world.. along with cracks they usually list instructions to play with No CD. I don't care about the hard drive space sometimes, so it's nice.