I'm pretty impressed with Matt Smith as the new doctor, I know a lot of people had reservations about someone so young portraying him, but I think that he was a good choice - commanding presence, not quite as manic as DT and a good dose of quirkiness that I think is vital. I also really like the way the relationship between the doctor and his new companion (Amy Pond) is shaping up. There seems to have been a shift to a state where it isn't always the doctor who has to save the day, a bit more evidence that he is fallible and that us puny humans can come up with a good idea or two on our own which plays out nicely in the relationship between Amy and the doctor.
I hadn't come across space whales before so this was new to me and I did enjoy that episode. Sophie Okonedo, as mentioned earlier in this thread, was excellent, and the puppet-like creatures were quite sinister (though I'm still not entirely sure what they were or how they developed). I was a little distracted by the appearance of the demon headmaster (from a creepy children's tv show in the 1990s) in the control room and I think that regardless or not of whether I'd volunteered for a job, after I'd been treated like that I'd have been off like a shot!
Regarding the daleks, I thought the white one that appeared first looked spectacular - updated but still very much the same creature (?) in essence and definitely recognisable. I remain unconvinced about orange and red daleks though, it has a feel of Ikea about it.
I'm immensely glad that they brought back the weeping angels! I maintain that of the new series' the scariest episode is still Blink (though I also highly rate those featuring John Simm as the master) which had everyone who watched it looking suspiciously at stone carvings for weeks afterwards. It was a genuinely scary concept - an alien you can't see coming and looks just like a pretty piece of ornamentation when you do look. I'm very much looking forward to seeing the concluding part of this 2-parter next weekend.
River Song is an intriguing character and Alex Kingston must have had such fun playing her. The idea of the doctor getting married is totally counter-intuitive and I really hope they show a little more of the development of their relationship as I'm sure it will be very entertaining. Didn't we leave a daughter (albeit a cloned one) off flying round the galaxy sometime last season too? That could be another character it would be interesting to see more of.
All in all the new series so far has impressed, but I'd like to see it developing some more scary episodes which I'd hoped for with Stephen Moffat taking the helm. I know it is in a prime time tv slot so can't get too graphic but I think that a lot of frightening or sinister things could be included without overstepping the watershed problem - the weeping angels being a prime example.
I look forward to watching the rest of the series!