MarsEdit 1.1fc1 is a final candidate release: you can download it from the beta page.
This release includes an updated Help Book, more graceful preview window updating, and a bunch of bug fixes. (The full scoop is on the beta page.)
In case you’re wondering: Gus is doing a fantastic job—not just doing the coding but also running the beta program. Very cool. (If you haven’t yet read his How to become an independent programmer in just 1068 days, you should. It’s good.)