Read this on my sister's blog.
Apparently there is now a new chemical called Senomyx that mimics the flavor of salt, sugar, or MSG by activating or blocking receptors in the mouth responsible for taste. Companies such as Kraft Foods, Coca-Cola, and Campbell's Soup are working to incorporate this chemical into their products. Their thought is that with this chemical, they can then reduce the salt and sugar amounts in their products by 1/3 to 1/2 while not harming the flavor.
While I understand their reasoning, I still find it a bit unnerving.