Well the basic install went pretty smoothly, but I wanted, of course, to use "friendly" URLs. For that Serendipity supplies .htaccess file with Apache mod_rewrite rules. With a little bit of effort it was possible for me to convert those into rewrite rules that lighttpd would understand.

He includes all of the rewrite rules lighttpd needs to mimic the responses of an Apache server in a rewrite-once statement, and a limitation on the files the server can send with an access-deny config line.