This was floating around yesterday. Via Boing Boing, blosxom. "Blosxom [pronounced "blossom" or "blogsome"] is a lightweight (to say the least -- it's <30 lines of code) Weblog-in-a-jiffy Perl CGI script for (but in no way limited to) Mac OS X. Blosxom simply nabs text documents (written in your text editor of choice) from a particular directory and displays them (in reverse chronological order) as a Weblog. Simplistic -- but a potentiallly useful spot of fun nevertheless."
Assuming this doesn't only work on OSX, now almost no one has an excuse not to blog! 
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