Debian Help has published a Lighttpd Webserver Installation guide for Debian

Security, speed, compliance, and flexibility--all of these describe LightTPD which is rapidly redefining efficiency of a webserver; as it is designed and optimized for high performance environments. With a small memory footprint compared to other web-servers, effective management of the cpu-load, and advanced feature set (FastCGI, CGI, Auth, Output-Compression,URL-Rewriting and many more) LightTPD is the perfect solution for every server that is suffering load problems. And best of all it's Open Source licensed under the revised BSD license.

Lighttpd Webserver Installation in Debian