Blink
ZOMG ZOMG ZOMG BEST EPISODE OF THE SEASON HANDS DOWN.
No, seriously. As jaw-droppingly awesome as "Human Nature" / "The Family of Blood" were this one takes the season. And look at that, another Steven Moffat episode immediately follows a Paul Cornell one (as "The Empty Child / The Doctor Dances" followed "Father's Day" in Season 1) and immediately pwns it around the block and twice on Sundays.
No there wasn't much of the Doctor in this one but anyone who read the New Adventures shouldn't be too put off by this. Hell, my favorite one (Warlock by Andrew Cartmel) barely had him at all. Doesn't mean it can't be a great Doctor Who story tho, and this one certainly worked. It was scary, which is what allegedly all great Who stories are supposed to be. The Angels were, no pun intended, a sight to behold. Once again continuing the theme of Moffat's of faceless monsters: as the Empty Child wore a gas mask, and the Clockworks wore masks to disguise their faceless ticking heads, the Angels cover theirs with their own hands so as not to look upon one another. Moffat has an obsession with faceless menaces, but let's face it (oo, another bad pun), it works!
With its time travel elements and influences, once again, by the new wave of Japanese horror flicks, "Blink" just GETS to you. Yes it does. Bet you'll never look at statues, or DVD extras, the same way ever again...
And frankly, if you didn't love this episode, you need to quit watching Doctor Who because you'll never get it, ever, and you therefore need a different hobby. Seriously. I'm hardlining on this one. Not even Jack's return next week will temper my resolve on this one, so, you know. Get with it, y'all.