I wrote something a couple of nights ago that I thought I’d share. I’m calling it “Gather,” and it’s basically an “appified” version of my Readability/Markdownify work. A Cocoa version of Marky the Markdownifier, if you will. You can paste in a URL and it will attempt to find the core text of the page, download it and turn it into Markdown for clean web clipping. It displays the result in a field you can copy from, and it can optionally auto-copy the result to your clipboard.
This is a companion discussion topic for the original entry at https://brettterpstra.com/2012/02/05/introducing-gather-a-cocoa-markdownifier