In going through last week's Christian Carnival (yes, I'm still working on that), I found Blake Kennedy's fascinating discussion of whether the Plymouth Brethren fit better within fundamentalism and evangelicalism. He wants to say the latter. I think his argument might lead to thinking of them as a borderline case, recognizing that the term 'fundamentalist' is somewhat loose and can include people who aren't at all like the paradigm cases. It's also possible that someone or some group might be a member of both categories.
What interested me most was his careful delineation of what's commonly associated with fundamentalism by those who want to distance themselves from that label by calling themselves evangelical. There is some overlap in some of these, but I think it's worth being explicit about some elements that are aspects of other, more general, traits. Many of these also admit of degrees, and thus someone or some group might be more fundamentalistic or less fundamentalistic than some other person or group. Fred Phelps and the GodHatesFags crowd will probably be among the most fundamentalistic, and I would say someone like Zane Hodges (most known for being KJV-only, hyper-dispensationalist, and antinomian) is more moderate in comparison with Phelps but still solidly a fundamentalist. John MacArthur is still a fundamentalist too, I would say, but he's much less so and is also an evangelical, albeit a more conservative one than most on these issues. I'm not sure someone who is KJV-only would be evangelical except if the person is really moderate with all the other features of fundamentalism (and there are such people).