NANA 1-11.5
This is the best anime I've seen in a while (probably since the first batch of Durarara episodes). A story of two very different girls, both named Nana, the show has struck just about the right balance of comedy and drama. I'd worried that it'd would be too melodramatic for my tastes, but so far that's not been the case at all.
Nana Komatsu is one of the most interesting and frustrating characters in memory. She's impulsive, reckless, self-absorbed, and overly dependent on others, yet she's also funny, sweet, and utterly loopy. I can't decide whether I love her or hate her. But regardless of my personal feelings towards the character, I can't deny that she seems real. There probably are a ton of young women just like her... well, perhaps not quite as dumb, but still.
An even better character is the rebellious but emotionally fragile Nana Osaki, and the chemistry between her and Nana Komatsu is what makes the show so enjoyable for me. I'm not quite so enamoured with the abundance of bishounen, who serve as a continual reminder that I'm not NANA's target audience, but nonetheless I'm eager to see what happens next.
If I have any complaints, it's that a) there are too many coincidences for my liking, and b) the entirety of episode 1 was repeated over episodes 6 & 7. Not only that, but there's a recap episode (the .5) bolted onto the end of the set. Recap after 11 episodes... why?