MarsEdit 2 - Powerful Blog Publishing For Your Mac: “Browser-based interfaces are slow, clumsy, and require you to be online to use them. While your blog's web interface struggles to perform the simplest of tasks, MarsEdit uses the power of your Mac to provide an amazing blog editing experience. MarsEdit is a desktop blog editor, so you can write a blog without giving up the comforts of your Mac.”This is a great blog editor for Mac.
Find more info about MarsEdit: http://kb.clipotech.com/marsedit