I just found out that you can bring your own stylesheet to MarsEdit. Right-click the weblog in the drawer, and select “Edit preview template”. Here you can throw in you usual LINK tags, and whatever DIVs and other wrapping your blog post needs to display properly. I’ve done that now with the Typo stylesheets, and it’s working well, except it’s including the sidebar. Pretty nice, nonetheless, it would be nice if Typo came with a template that you can just copy-paste.