Markdown is a plain text formatting syntax. A Markdownifier is a tool that converts html to Markdown, using an algorithm to determine what part of the page is of interest, resulting in a plain text representation of a page. Marky is a Markdownifier created by designer and writer Brett Terpstra. The Marky API provides developer access to the Markdownifier.
In what is surely a sign of the next big thing, there's now an API named after Mark Wahlberg, or at least his 1990s rap alter ego. The Marky Markdownifier API can't promise the good vibrations of a dance party from yesteryear, but it sure can convert HTML pages to markdown. And really, in 2012, no bunch is funkier than a developer tool that both consumes and provides an API.