[aeturnum]

My impression was that they started the project by porting Left4Dead, but decided to release TF2 (probably because it's F2P and so anyone can test it).

[thejosh]

TF2 also has microtransactions so it will also earn them money in the short AND long run as well.

Quite a smart business decision and I'm glad they brought TF2 over - I always thought this would be the first game to publicly release.

[improv32]

It was also the first game they brought over for the mac port, though I think that was before the in-game store.

[lloeki]

Wasn't that Portal, which I got for free at that time?