Corn Gluten The Ultimate Weed Killer?

Anyone ever heard of, or tried, this?
http://www.gardensalive.com/article.asp?aiT4
Patrick
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snipped-for-privacy@aol.com wrote:

I tried corn gluten to keep the weeds down in my asparagus patch. It worked well, but it was very expensive. Preen would have served as well at a fraction of the cost. NB: corn gluten and Preen are pre-emergent weed preventers, not herbicides.
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