Rewatching Series 5 of Doctor Who (and a couple earlier episodes) before Series 6 starts up in a couple weeks.
Watched Silence in the Library/Forest of the Dead (from Series 4) last night, then the ending to The End of Time (for the regeneration scene); watched The Eleventh Hour earlier today, and I'm about to watch The Beast Below before I head to bed.
I'm way more excited for this series than I was for last series, I have to admit. I'm not sure where I stand on the split-season format, though - I guess it'll depend on the strength of the "game-changing" cliffhanger.