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The main "must-have" feature is trackback, which allows people to reference your posts, and your server knows when they do. The other is RSS feeds, which allow people to syndicate your information.
My "personal" blogs are at nostatic.com/blog and simpleflower.com/blog. Work is weblogs.usc.edu, and I participate in some other ones, as well as some wikis that impersonate blogs (socialtext workspaces...those are password protected though, but we're working on public spaces).
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