Well, there can only been one words for that series:
Fantastic!
The plot was nice and tight, tying up the various plot threads running throughout the series, as well as containing some good little stand alone scenes - Lynda's fate was particularly chilling, with the Dalek hovering in space, it's headlights flashing out "ExTERMINATE" then blowing out the window she was standing next to.
I think I'm gonna have to try and find a toy Dalek from somewhere - I'm really starting to like the evil little buggers, and my desk at work's just begging for something to guard it.
Anyway, as for the revelation about the Bad Wolf, I have to say I'm impressed. Everyone (myself included) assumed it was a person or a thing when in fact it was a meassage left by Rose for Rose. Nicely paradoxical if I do say so myself. Of course, I'm now half expecting it to show up in the episodes with the 10th Doctor in a true more-than-meets-the-eye wheels-within-wheels kind of way.
And speaking of the 10th Doctot, ye gods how short is he? And please let him ditch the leather jacket - he looks far too much like the-guy-who-isn't-Jeremy-Clarkson on Top Gear. Richard something-or-other I think.
But all in all, roll on Christmas!