I'm using dasBlog because it's .NET based & I wanted to host it myself. But I've started to tire of the IE-based interface and thought it was time for a desktop tool. BlogJet is the obvious choice, but I wanted to see if there were any decent free tools available.
Tankfully, Scott Hanselman had a post about Windows Live Writer (MS' new free blog writing tool) and some other editors. So we'll see how it goes. ;)