The best, one of the best episodes of Doctor Who. The Daleks were more unnerving than ever, it was cool to see Davros and some of the former companions return, plus seeing the spin-off crossovers and as for the end..
All I will say is that I hope that what happened in that cliffhanger scene doesn't reach it's logical conclusion.
And, gosh, you know it's a goodie when you start texting friends, they start texting you, you get a phone call from one of them, purely to discuss the episode, you go on Facebook and many of your friends refer to it in their online status.
Guys if you haven't watched it, you must and you can find it here, so there's really little or no excuse ;)
Oh, and (hat tip to WongaBlog )here is the video used in the Doctor Who story Human Nature/The Family of Blood. Worth watching if only to see David Tennant ad lib for the fast forward bits