Did they even mention the word "Silurian" in this episode. I heard Homo-reptilian, former owners of earth, and I think something else. Here I am thinking they introduced a new race, and everyone knows who they are? That was one of I liked about RTD who. They brought new fans up to speed with short descriptions on what they were encountering.
I liked this episode. Not the best one of the season, but still very enjoyable. Like others said, it was mostly set up, but it was good set up and looking forward to the next one. As for the settings and stuff, I've been liking them all season. They make things seem more organic and real. Also, it's very appreciative to see more scenes in the Tardis. I still feel since "Rose" that they really haven't done much in terms of developing the TARDIS for the newer generation. One time it was implied that it was alive, but that's pretty much it.