The following macro copies the selected title of an article and then switches to MarsEdit and pastes the title. It then switches back to Safari and copies the URL for the article, and finally switches back to MarsEdit to add the link. This macro does exactly what you would do manually, but it does it with a simply keyboard shortcut trigger. I tried using Keyboard Maestro’s Set Clipboard to Past Clipboard action to reduce the switching back and forth between apps, but that macro didn’t work consistently.
You can see a video of how it works, here. I slowed the maco action down some so you can better see how it’s done.