Posting from Blogo
Blogo is a really simple and easy to use application that allows you to make blog posts from your desktop.
From their website:
Easily publish text, images, videos, slideshows and more.
With a simple, intuitive interface and support for Wordpress, Blogger, Typepad, Typo, Drupal, Joomla, and Expression Engine, Blogo is the best
way to maintain your blog and spread the word with Twitter, Ping.fm and other supported services.
As a test, I am publishing this from it to see how it works. It was able to upload pictures and it picked up the categories, but the selected category was not applied to the actual post, neither did the custom date.