Evgevny Morozov is a great place to start; he can go a little off the rails but much of his critiques of technological determinism are well-located.

I don't fully subscribe to all of Model View Culture's political aims but their arguments need to be engaged with.

In a different direction, what the Long Now foundation does with trying to reframe our focuses on the ultra-long-term is powerful.

Outside of that, I see much (maybe too much of it) happening on twitter, not enough written out. Definitely a challenge to improve.