I'm probably going to get flamed for this, but I'll say it anyway. I like Valve's Steam tool for the same reasons that I like Stardock Central. My HalfLife 1 CDs are long gone, but sometimes I want to play a couple rounds of Day of Defeat. Were it not for Steam, I'd have to go buy the game again.
I think Stardock and Valve are both thinking ahead to the future with good software delivery and "license" (CD-key) management systems for their customers.
-Proud Canadian