Ratings dipped to it's lowest for Tigh Me Up, Tigh Me Down, according to Gateworld.net:
Battlestar Galactica finished the evening with "Tigh Me Up, Tigh Me Down" at 10 p.m. The episode earned a 2.1 household rating, down four-tenths of a point (16 percent) from the previous week's episode. It is the series's lowest rating to date.
Stargate SG-1 got the same rating, while Stargate Atlantis received a 2.2.
Finally, I found some very interesting news on Season 2: The detailed plot summaries of the first two episodes!
I'm not going to post them here, but take a look if you want some spoilers to hold you over: