"Textile is getting pretty close to what I had hoped it would be: a place to simply write and not think much about code, and get valid markup in the bargain. " [Textism]
Here is an interesting tool that seems useful enough for simple online publishing. However, it seems (though likely very easy, I'm sure) to have yet-another-special-syntax-to-learn. Bah! Well, I'm recording it for what it's worth and I hope to come back and learn more about it!