Markdown and Evernote. It is (sort off) finally there.
Found this tool the other day that is making it possible to write simple Markdown documents (http://en.wikipedia.org/wiki/Markdown) that will convert into nice looking formatted Evernote notes.
It seems all very new, but the basics are working great. I can write my stuff, it autocompiles (it is split-window) so I can see what I do and the results are autosynced to Evernote.
Only problems I've had so-far is that when editing later in Evernote, the syncing back towards Marxico is inconsistent. Also, currently, the tools is using plain-old-http and no https, so I'd not use it for anything too sensitive (or on an open network).
Marxico – Markdown Editor for Evernote
The Best Markdown Editor for Evernote