I just stumbled across a promising-looking note-taking app called Growly Notes. (http://growlybird.com/GrowlyBird/Notes.html)
I’ve tinkered with it for a bit, and it works really well—and it’s free. I think it might even give Circus Ponies’ Notebook a run for its money in my applications folder. Mostly because it, unlike Notebook, provides both a vertical and horizontal scrollbar on the page.