I have a couple of blogs hosted on blogger.com. In MarsEdit's main window, in the "Blogs" source list, they each have the Blogger icon next to them. It would be good if I could use a custom icon, to help me know I'm posting to the correct blog.
Thanks, good idea. I'll think about this for a future update.
This is a sort of a rough workaround for the problem, but you could theoretically replace MarsEdit's cached "Favicon" graphic for the blog, with a different one.
[Home] -> Library -> Application Support -> MarsEdit -> Favicons
If you were to for instance, open one of the .ico files in Preview, edit and save it back to the exact same file name, I believe when you launch MarsEdit again it will use the updated graphic.