I use Ecto to do most posting to this site. It's a great rich text blog posting client for the Mac, but the Windows version doesn't quite measure up.

Lately I've been fooling around with Writely, which along with being a platform-independent online word processor and collaborative document editor, allows for (single site) blog posting. I'm going to test it out and I'll let you know how it works. (You can get a beta account at Writely.com)