http://en.wikipedia.org/wiki/User:Greg_Williams
I just discovered this via http://en.wikipedia.org/wiki/The_Rutles
Hillarious at times, but almosy always breathes some new life into some popular -- or pretty heavy -- Wikipedia articles... including a certain homonym-filled sentence (http://en.wikipedia.org/wiki/Buffalo_buffalo_Buffalo_buffalo_buffalo_buffalo_Buffalo_buffalo).
Those are pretty good, not quite as biting as I would have thought though.