Richard Dawkins is a clear example of someone who could easily be called a "scientific fundamentalist". When you follow his arguments on religion, it seems plain that he's become a very mirror image of the very fundamentalists he claims to be in opposition to.
Despite having little apparent understanding of religion from any sociological, psychological, or anthropological point of view, he has strong opinions on religion that he's very aggressive at delivering. Yet his opinions are opinions, and clearly there is no scientific basis for the position he's taking.
The result is that in combating the Creationist arguments, he's turned reductionism into a belief system in itself.
In that regard, I think Dawkins is clearly over-stepping the mark between scientific method and exposing opinion, with the point that he tries to conceal the boundary between the two.
From my reading of Tao on the forums, he doesn't read as a "scientific fundamentalist", but instead more like a "moderate rationalist" - he seeks a rationalised explanation of phenomena according to existing scientific evidence, with the caveats that a) science may not be able to currently explain all phenomena, and b) that any existing explanations may be incomplete.
Just my 2c of psycholanalysis, though.