I've always liked Notational Velocity for OS X. It's minimal but functional. The latest version has some impressive todo features as described here: http://scro

I've always liked Notational Velocity for OS X. It's minimal but functional. The latest version has some impressive todo features as described here: http://scrodlog.notational.net/notational-velocity-204 http://scrodlog.notational.net/notational-velocity-204