While reading some weblogs this night, I found Kevin Burton's records-mode for Emacs to be a really promising tool to maintain a Weblog from my editor. Browsing the code did not reveal the important component of publishing the news using Blogger API, but it should be easy to add it.
Now if I can only have XEmacs running natively on MacOS X... It's so annoying to run it in X-Windows emulation mode. Maybe after I finish the Cocoon control flow layer, and implement the user feedback application for Anteater using the new Cocoon, I'll look more closely at porting XEmacs.