I start tons of seed every year, just in regular miracle gro potting soil. The seeds do not need the fertilizer, but that I can tell it doesn't seem to harm them. I do this because I buy it in huge bags and I don't want to buy two different kinds. If you start them in seed starting mix, then very soon after germination you have to move them in to something else.
With Miracle-Gro in it, it is definitely not considered organic. That's to me less than ideal, but I live with it, because it is so much easier and cheaper. Once they are out in the garden, everything else I do is organic.
My newest resolution (out of the discussion on conservation in a different thread) is that in 2012 winter, I will not use the peat moss/miracle grow stuff any more. Peat moss is mined and is not renewable in the short term and miracle grow is a petroleum product. So I am already looking in to how to buy coconut coir (renewable substitute for peat) and perlite. I am planning to mix the coconut coir, perlite, and some of my own compost to make homemade potting soil. Have not done it with coconut coir, years ago, I used to make my own with peat moss.