Lawn Weed Indentification and Control

We live in Massachusetts and put down a corn gluten pre-emergent weed control product back on March 19th.
Although the lawn is still dormant, we've noticed some type of weed has emerged (March 27). Can anyone identify what type of weed it is (URL to picture is below) and the best way to get rid of it / prevent them going forward (organic if possible).
http://www.addieryan.com/2006/2006March_LawnWeed.JPG
<img src="
http://www.addieryan.com/2006/2006March_LawnWeed.JPG " />
Thanks, rw
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Looks like Henbit (Lamium amplexicaule), a member of the mint family. The best time to control Henbit (non-organic) is in the fall with a postemergence broadleaf control product.
An organic approach would be to pull these weeds now, and mow high (2.5-3 inches) the rest of the year... pulling the henbit when you see it. The taller grass should smother the henbit seedlings.
I will be composing an article about Henbit on our website at the following page: http://www.stockseed.com/weeds_henbit.asp ... look for it in a few days.
John
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Update: I have posted the information for Henbit to http://www.stockseed.com/weeds_product_display.asp?pid 3 instead of the link previously posted.
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