SharpMT
"I tried a few different tools out there that promised exactly that: offline authoring. However, most of these applications were written with the most generic set of blog fields possible, to support the largest number of blogging servers possible. I use MT and I needed all of the fields that MT specifically offers, so these existing tools didn't work for me. Also, I found that when I wanted to link new entries to existing entries, I had to go online and dig through my old posts to find the article link, which was painful at times. And so I started SharpMT."