Dandelions are the enemy in the war for the pristine green lawn. However, they are incredibly beneficial to many insects and pollinators, and there are a variety of ways to cook and eat them.
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Sources:
Ode To The Dandelion
http://druidgarden.wordpress.com/2014/05/26/ode-to-the-dandelion/
Taraxacum
http://en.wikipedia.org/wiki/Taraxacum
Taraxacum officinale
http://en.wikipedia.org/wiki/Taraxacum_officinale
University of Maryland Medical Center - Dandelion
http://umm.edu/health/medical/altmed/herb/dandelion
National Gardening Association - Fall Garden Cover Crops
http://www.garden.org/ediblelandscaping/?page=september_cover