This project is in active development, and is very early: use at your own risk. First phase will provide read-only support to an Evernote account: second phase will allow writing to the filesystem and thereby storing data in Evernote. Forks with useful new functionality are always welcome.
Requires MacFUSE, available from code.google.com. Currently requires a seperate account on lb.evernote.com, Evernote's testing sandbox.
Install MacFUSE, restart as suggested.
Download the source, build in Xcode, and run.
Enter your lb.evernote.com account information in the preferences, and you're off and running.
You can download this project in either zip or tar formats.
You can also clone the project with Git by running:
$ git clone git://github.com/rpj/evernotefsapp