I've read tens of thousands of words on various paleoish blogs in the last year, as well as listening to hours of podcasts. I've gleaned from this what strikes me as a very convincing argument that gluten should be avoided. But I don't think I'd be able to summarize this argument in a thorough yet concise way, and I don't have a good resource to refer to which to refer someone who hasn't been steeped in this stuff.
So I'm looking for an online resource that gives this kind of summary- something that someone could read through fairly easily, and come away with a good sense of the scientific evidence that's out there.
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The links Jason listed are great, a favourite of mine to give the unenlightened is this Tim Ferris blog post that features a chapter from Robb Wolf's book. IMO it gives an incredible, easy to read, overview of why grains should be avoided.
These two posts by Mark are pretty good sources of general information:
And this post by Kurt Harris is really good:
Hope that helps. I don't know if there is a definitive primer anywhere; I don't recall seeing one yet.