IA Writer gets a nice upgrade – IA Writer gets a small new feature that I like a lot – highlight text by surrounding it in equal signs.
I use highlighting quite frequently, to make little notes to my future self as I write.
Also, new publishing and preview features, and pointer support on the iPad. Nice!
Lately I write in either IA Writer or rich text, using DevonThink as the back end. I use Drafts quite a bit too.