For the ones looking for the live transmission, check
http://www.digisportlive.biz/
or
http://meciuri-live.org/digi-sport-live-online/
Yes, is Romanian, but at least is more than nothing. They are broadcasting live F1 and MotoGP (usually entire weekend, meaning practice sessions, quali and races), but also GP2/GP3 (last year some recorded). Pay attention that there are 3 channels (DigiSport 1..3), so sometimes they are juggling with them when concurrent events are taking place.
Why Bernie is not introducing a proper live streaming (see MotoGP) is beyond my understanding, like it was the stupid remark regarding HD broadcast. Good to see some other series are broadcasting live, free of charge, 'cause in the end, you want exposure for your series and sponsors. I would have no chance is seeing ALMS here without internet streaming.
Good luck with a good stream tomorrow and Sunday morning!