I stumbled across a few interesting links of note. The first one discusses common low-carb myths that are used by opponents of low carb. It also has a low-carb food pyramid - which is refreshing.
Wikipedia has a great description - better than my writing skills:
Discussion of the Atkins diet - I just don't agree with the limitation of fruits and veggies or the structured carb counting :
And finally, the Paleo, or Stone Age Diet: