My favorite quote of the article:
The most unexpected testing issue that came up was our inability to saturate the Tux-based Web server on our standard test server configuration because it was so fast, a problem that forced us to remove two processors from the four-way Dell PowerEdge 6400 server (which was equipped with two Gigabit NICs and 2GB of RAM). This was the only way the testbed of 80 workstations could max out the Tux server.
I've been meaning to give Tux a try. . . perhaps now would be a good time. ;-)