I just downloaded the 21-day trial version of ecto, the popular deskop blog editor for the mac. I have to say that I am not at all impressed with it so far. The documentation is terrible, and the screenshots don't look anything like the actual software. I am guessing that they were based on an older version and never updated. That may be okay in some cases, but the interface on this version does not look anything like the one I'm seeing in the few tutorials I can find. I suppose this thing may also just have a very steep learning curve, but I don't know if I have the patience to stick with it, much less pay for it.
In the unlikely event that you are an ecto expert, the main issues I am having seem to be with image presets and custom post templates. I have Blogger set up to use a post template, but there does not seem to be any way to get ecto to do this.