Does Evernote suit your fancy?

I use Notebooks[1] on iOS. The big draw of this application for me is the ability to synchronize via WebDAV. I do not want to store my notes on any 3rd party server, but want to be able to access them on mobile devices and this is the compromise that I found.

On Mac OS X, I use nvALT[2] setup to use the same directory.

The directory itself is inside EncFS filesystem, which is mounted over cyphertext directory inside Dropbox so there is continuous encrypted sync as well.

[1] http://www.notebooksapp.com/ [2] http://brettterpstra.com/projects/nvalt/

I use iA Writer on iOS, coupled with nvAlt on Mac. They both read/write from the same dropbox directory.

You might also like Drafts for iOS - it's really more for write --> push to x service, but it does that really well.

I use Jotterpad on Android and it works well, also can sync to Dropbox (though I can't testify that works well, as I haven't yet)

I Use nvALT on OS X, and Drafts on Android.