First of all I would like to mention that I am posting this through writer only. And the most important thing is its damn good.
It does support a lot of blog services and you can add a number of accounts and also switch between those accounts to post articles.
The interface is nice as well. Haven't come across any bugs as of yet. I have just started using it. And I implore all you bloggers out there to give it a try. Its free after all.