Quite a few indie games are on there, look in the indie games section.
Yeah true, but they are made by larger companies. Hmmmmm, actually discount that. Just remembered things like World of Goo were made with like 4-5 people or something. Well, if Badspot took a stand and called Valve, we could probably get it on Steam. But is it worth the trouble? You can just click "add a non-steam game" and add Blockland to Steam like that.
EDIT: I want a copy please. bsquizz@gmail.com