As a developer you may not want it - but my friends who are copywriters, editors and content strategists will LOVE this. A simple way to grab existing web content as markdown, which many are already using to write and edit their content.
I had made a converter that used XSLT and produced actual selectable and copy-able (?) markdown text; didn't gain much traction; I'll post it again to see if anyone's interested.
http://markitdown.medusis.com/
Converts any rich text to Markdown (vanilla Markdown, but selectable).