You can always order meat and vegetables at any restaurant to keep eating the low carb way, but sometimes you want to try something more adventurous -- and know what you are eating. Many chains are capitalizing on this trend by creating custom low-carb menus. I will be adding to this list.
Blimpies (rollout begins in the NorthEast)
See their menu! (Doesn't seem to be anywhere else on the site yet.)