Neville has a great review of Blogjet and Ecto on his Blog "NevOn". These are "standalone" tools that help with composing and posting Blog articles. The strengths and weakness of each are discussed in detail.
His comments about the changes planned for Blogjet Version 1.2 are promising. I tried Version 1 and the problem with category posting and lack of thumbnail pictures for TypePad were my only reservations. I will have a look at 1.2 when it arrives.