Zempt is a desktop blogging client and writing tool that is especially useful for those that have multiple blogs. It enables you to write, edit and spell check new blog posts as well as edit previous blog entries by downloading, editing and reposting them. Having been involved with the Zempt project for five years (and being the only developer for the last two or three) I am pretty familiar with some of the issues that can come up with remote editing of blog posts.
Most folks running WordPress use some flavor of Unix/Linux and Apache. If you are like me and run WordPress on IIS, it can be frustrating at times because you tend to feel a bit like a stepchild. There are several cool plugins for WP out there, but many just don’t run on Windows, at least not without heavy modifications.