Having spent some time last week looking at Simplenote, Notational Velocity, and some of the other minimalist alternatives, I noticed that many "Mac-centric" people claim they are most productive using a text editor of some sort, plus a lightweight markup language like Markdown or MultiMarkdown, also used by Scrivener.
As John Gruber says, "Markdown is a text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML). - Thus, “Markdown” is two things: (1) a plain text formatting syntax; and (2) a software tool, written in Perl, that converts the plain text formatting to HTML."
It occurred to me that Wiki Markup and lightweight markup languages have a great deal in common and that I have essentially been following the same approach for years: I write most everything first in ConnectedText, and then convert it to RTF, in order to finish it up in a word processor (which has been Atlantis for some time now).
There is no reason why I cannot convert ConnectedText's markup into HTML. In fact, it's easier than RTF. ConnectedText supports exporting to HTML and XML for some time now. I just have to choose Topic|Export and choose the format.
It would also be easy to export fragments of text by adapting the RTF script I talked about in Wiki Markup to RTL.