If you love classic games but feel the need to own things in order to bring some sense of stability to your life, GOG.com (that's Good Old Games) could be a good alternative to GameTap for you. The company recently announced that you'll be able to find out for yourself if you sign up for the beta before Sept. 8, at which point the gates will be opened to the masses, or at least the masses that signed up.
We love GOG.com's approach, with $5.99 and $9.99 DRM-free releases that you can download as many times as you want and don't need an internet connection to play, but we wish the selection was a bit better. But who knows? With a beefier roster GOG could be a real Steam contender.