Lighttpd is a lightweight and high-performance event-driven web server.
Nginx ("engine x") is a web server, reverse proxy, TCP stream proxy and mail proxy, released under a BSD-like license.
"It s simple and nginx is even more ridiculously fast and lightweight than lighttpd"
from question "How to implement a secured download system?"
"Nginx seems to be the webserver getting the majority of the buzz lately it may be able to serve faster than lighttpd maybe not"
from question "Serving static images thru Lighttpd"
"Shortly put running some benchmarks on a page doing some database operations and serving static dynamic content has shown that plain cherrypy was twice as fast than nginx and memcached and about half faster than lighttpd"
from question "Cherrypy : Do I really need to put it behind a frontend?"
"I actually found the setup of nginx much easier than lighttpd not to mention that you can install a macport of nginx port install nginx +ssl that does not contain the ssl-breaking bug that lighttpd suffers from here"
from question "Lighttpd + fastcgi + django: truncated response sent to client due to unexpected EOF"
"According to this benchmark nginx is a little bit better than lighttpd for serving bigger static contents so nginx would be a good choice for static flv video contents"
from question "What's the best webserver software for video?"