Great Viral Videos for Firefox, plus "Is Viral Overexposed?"

Viral marketing is spreading like, well, Firefox (the open source, grassroots web browsing software alternative). This trend is dramatically illustrated by these very funny Firefox videos produced by Mozilla Europe. And they are neatly complemented by this reasonably insightful commentary on viral marketing by Mark Kingdom of ClickZ Networks (even though I apparently liked the videos more than he did). I think that the point that he missed is that it helps a viral marketing message spread when that message is meant to strike out against the "evil empire" (Microsoft) rather than simply to sell random widgets. Do you agree?