Wordpress

[Tim Chase]

As for free WordPress, you can install/use the XAMPP stack (or 
even just WordPress, which is an apt-get away), or even just 
google for "free wordpress hosting" (though I'd only use it for 
junk-posts and testing, rather than anything I relied on).

In addition to the other replies, you might be interested in reading

http://srackham.wordpress.com/2008/05/22/blogpost-media-processing/

which allows you to work locally, writing in AsciiDoc text 
format, and then use the documented "blogpost" tool from the 
command-line to post the entry to your WordPress blog.

-tim