I've put together two small web apps to demonstrate pandoc:
1. [html2x](http://johnmacfarlane.net/pandoc/html2x.html) can convert
most web pages to markdown, reStructuredText, DocBook, LaTeX, ConTeXt,
RTF, or groff man. Bookmarklets are provided. html2x is modeled
on Aaron Swartz's [html2text](http://www.aaronsw.com/2002/html2text/),
but it's faster, supports multiple output formats, and behaves a bit
differently (for example, it wraps text, puts all the links at the
end instead of interspersing them, and uses text instead of numbers
for link identifiers).
2. [Try Pandoc](http://johnmacfarlane.net/pandoc/try) allows you to
experiment with pandoc without going to the trouble of installing it on
your system.
I'm also pleased to report that the most recent version of pandoc
(0.44) is five times faster than previous versions, and can now parse
the TextMate manual in less than a second on a Core Duo 1.66GHz machine
(vs. over 15 seconds for Markdown.pl 1.0.2b8).
John