| Depends on what your definition of lightweight is.  I don't consider Wordpress lightweight anymore, it's definitely out of that category now but the features it offers are top-notch.
 I switched from MovableType (very great cgi/perl application at the time) to Wordpress about 2 years ago and haven't looked back.  Wordpress has basically become the standard in blogging.
 
 If your host offers Ruby on Rails, try typo as well.
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