There’s no excuse to not publish blog posts, you can do it from anywhere using various web tools!
Wordpress (Press It)
Blogger (Blog This)
Google Reader (Blog This)
…no longer available, but I’m sure lots of RSS Readers have this feature.
…most blogging platforms have this feature anyway.
BROWSER EXTENSTION (right-click)
…I have a bookmarklet that opens a sidebar in Internet Explorer (can’t find a reference to it on the web)
Quick Blog (Blogger)
NOTE: Sabifoo doesn’t qualify as you would have to splice this feed into your blog feed.
SpinmyBlog, by Spinvox, is a service where you can phone and leave a voicemail which will convert to text and publish to your blog.
If you promote your Spinvox number on your blog, people can ring up and leave voice comments that get converted to text.
[ADDED 02/06/07: Speakageline - post audio or video bytes from your phone, these would be podcast blog entries if your feed is podcast enabled.]
[ADDED 05/11/07: Springdoo]
Publish a post that has a future date, the post will magically publish in the future
What about publishing a blog post using a telegraph…see the hack to generate feeds!