I swear by Evernote, which not only has a smooth interface for note taking, but keeps everything in the cloud and syncs across devices. You can also save things like web pages, PDFs, pictures, video and audio, AND it gives you an email address so you can email stuff straight into it. Everything is also eminently sortable. Works on iOS, Android, PC, and Mac (and maybe more! That's just what I have personal experience with!)
Do you like barebones apps? IA Writer is really nice if minimalist just-get-words-down design works for you, and syncs with Dropbox. It also has a customised onscreen keyboard so you have access to punctuation right there instead of needing to switch between layouts. Plain Text is in the same vein and free, but not as polished and I don't think it has the improved keyboard. I used Notebooks for a while but had problems with losing what I'd written - not something I've heard other people encounter but not something I wanted to risk again once it'd caught me a couple of times.
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