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I recently wrote how difficult it was to read a fully marked up latex document. XML is, in my view, worse despite all the hype that it's human readable; mostly it's not.
Usually when you're writing something, you don't need a whole lot of markup, because the document's are not normally that complex. What's important is that whatever format you choose to finally display that document, works for that document. Lightweight markup is ideal for this end.
Another advantage of lightweight markup is that you don't need any bloated word processor or other complex programme; it can be edited in your favourite text editor.
There are plently of good lightweight markup languages that do the job and plenty of tools to convert them into formats for publication, such as Latex or HTML.
These are a few of the most popular. At the moment I'm using Textile, chiefly because it doesn't require long urls in the text, but allows them to be put at the bottom (or anywhere else) in the document.