In my continuing quest to use both Ulysses and MarsEdit in my writing workflow, I’ve created a Keyboard Maestro automation. This one sends HTML from the clipboard to a new post, while remove the H1 tag and placing it as the title of the post in the MarsEdit window. It’s a bit brute-force, and could be more elegant, but it works. (See this macro on GitHub.)
For more on this topic, see: Sending text from Ulysses to MarsEdit