At least half of the titles in that list appeared in Humble Bundles, and I'm guessing a lot of those games wouldn't have been listed otherwise (Darwinia, AYIM, etc.).
Slim pickings still, but much better than just TF2/SS3:BFE.
The real surprise in the list is The Book of Unwritten Tales, which I think is the only non-Valve/non-Croteam title in the catalog that was not available on Linux before today. And in its genre (traditional graphical adventure) it's a very high-profile title.