First, the SPECweb benchmark (which Tux was subjected to) is a
mixed static/dynamic benchmark. Tux is not only a static web server
(like the old khttpd) but a full-blown one (for example, the PHP
4.0.6 will have a SAPI module for Tux).
Second, yes, Tux is definately a web server to keep an eye on.
You can get more info from the Tux manual at http://www.redhat.com/support/manuals/TUX-2.0-Manual/index.html.