If you can think of a methodology that won't make you puke, please suggest it. Yaws is easy to install on most platforms (like "apt-get install yaws") and very easy to configure. Maybe in the academic sense you can poke holes in the methodology, but in the practical world I can't think of a more clever way to test real load. When it boils down to it Yaws would be much more likely survive a digg effect or DoS attack, period.