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I like Textile too, it has the cleanest "link syntax":http://txstyle.org/doc/12/links. It's supported in Redmine and ikiwiki.

Textile does tables too.

http://redcloth.org/hobix.com/textile/

For styled web content, I prefer Textile. For beginners who don't need to CSS style content inline, Markdown is better.

I think its primary flow is the link syntax.

As far as I remember, github's wiki pages used to be in Textile format. I might be mistaken here, but I remember being annoyed all the time by the link syntax.