Blogger: - Feathers - Self-hosted - More flexible templating (though I haven't used Blogger in ages) - Extensible WordPress: - Feathers - Good co

Blogger: - Feathers - Self-hosted - More flexible templating (though I haven't used Blogger in ages) - Extensible WordPress: - Feathers - Good code (ok, that's not really a feature, but I think it's worth noting as it's the only self-hosted one listed, despite it being a low blow) - Better templating (not just straight PHP, a custom engine similar to Jinja/Django) Tumblr: - Self-hosted - Easier to extend/theme - Ability to manage content types (Feathers), not locked down the same 6 or 7 Posterous: Not sure, never used it. ----------- There are many other differences obviously, but these are the major feature differences I can name off the top of my head. Also, I haven't used either of those in ages aside from making sure importing works so I may be off a bit.