w.bloggar 4.00 has been released. It now supports XHTML tags, some new blog service features, and uses more XML for storing stuff. You can find the full changelog here. The Gecko-based version is still in beta. The IE Patcher tool seems to have problems with the new version, giving a connection error when I try to post.
As always, you can find w.bloggar’s main page linked from the image on the left.