MarsEdit 4.5.2
This update brings long-awaited media syncing functionality for WordPress blogs. After you refresh your blog in MarsEdit 4.5, all the existing images and files from your blog will be available for re-insertion from the Media Manager’s “Published” tab.
Historically, this tab has included only files that are uploaded from MarsEdit itself. This limitation was based in shortcomings of the WordPress API (the interface MarsEdit communicates to the blog with), but the API has since been updated to support downloading a complete list of the published media files.
This is really cool. I ran into some issues when syncing large numbers of images, and these have been addressed in the 4.5.2 update.