gnome-blog lets you post to bloggerAPI and MetaWeblog compatible blogs
including blogger.com, blogspot.com, advogato.org, pyblosxom, moveable-type.

Features:

* Operates as a panel object ("applet") or a standalone application
* Clean interface doesn't get in the way of what you're writing
* WYSIWYG styled text support
* Entries can be written gradually over the course of a day, popping
  gnome blog open and closed as you have thoughts to jot down and
  then posting at the end of the day
* Supports many different kinds of blogs

WWW: http://www.gnome.org/~seth/gnome-blog/