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Well, Ben, there's nothing that rises to the level of courtroom proof in the way of evidence excavated yet no, but the concept is not exactly new.

Basically, the Haida band, who are the indigenous First Nation of Haida Gwaii (the archipelago which you non-PC foreigners are probably more familar with as "the Queen Charlotte Islands") display such a number of cultural similarities to the Norsemen that many reasonable people find it less of a stretch to presume that there was contact between them than to assume a remarkable cascade of coincidences. Let us take an example, boat design.

""Yakutat," or "Northern-style" canoes include a variety of design forms, including a characteristic curve and swelling near the bow. The prow of the canoe gracefully curves up from the water and can be adorned by elaborate carvings."
http://www.amnh.org/exhibitions/expeditions/treasure_fossil/Treasures/Haida_Canoe/canoe.gif [amnh.org]

Now, contrary to the learned discourse above, these are not actually characteristic of Haida design. There is one other culture that designed its ocean-going vessels with those same "characteristic" traits. Care to guess what that culture was?
http://www.geocities.com/dragar.geo/WSP/Pix/longship.gif [geocities.com]

Those are just the first two images Google search came up with for each; if you look into it further, you'll find that the similarities are more striking than those two make apparent. Striking enough that when Haida/Tlingit take their canoes on cultural exchanges to Europe, they constantly get questions along the lines of "why did you make a longship out of a single tree trunk and paint it funny?", as Europeans just assume that the design is a conscious imitation of the Norse, not their own.

Also, the Haida are physiologically distinct, rather dramatically so in fact, from every other American aboriginal culture; they are taller, whiter, grow facial hair, and produce significant quantities of brunettes and redheads.

"Marchand also described the Haidas of Queen Charlotte Islands whom he visited in 1791. He found them not differing materially in stature from Europeans, better proportioned and better formed than the Sitkans and without the gloomy and wild look of the latter. Their color he found did not differ from that of Frenchmen, and several were less swarthy "than the inhabitants of our country places' (Edward L. Keithahn, MONUMENTS IN CEDAR: The Authentic Story of the Totem Pole, Bonanza books, New York 1971:19-23, emphases supplied)."

This is not consistent with Haida mixing with Asian genetic pools, or any other Western North American genetic pool, or hell any other race bordering the entire Pacific for that matter. On the other hand, this is remarkably suggestive of significant admixture with a Scandinavian genetic pool, yes?

Anyhoo, if you'd like to look further into the theory that the "Vinland" of the sagas is actually British Columbia, specifically the Cowichan Valley of Vancouver Island, here's a page for you:

http://www.spirasolaris.ca/sbb4g1ev.html [spirasolaris.ca]

Actually living in British Columbia, I can attest to the plausibility of all the little details. The one that really struck me was his identification of the Oregon grape with the always-problematic 'grapes' of the sagas. As pointed out on this page, the presentation in the sagas does seem facially invalid:

"As for the grapes in the Sagas, James Robert Enterline wrote in VIKING AMERICA (1972):
In the Saga of Eirik the Red, after Thorhall the Hunter went off by himself, some writers have inferred that he found grapes and ate of them, becoming intoxicated, for he was discovered on a steep crag where:" he lay gazing up into the air with wide-open mouth and nostrils, scratching and pincing himself and muttering something ."
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