In the 2009 DANDR (Dr. Atkins' New Diet Revolution) paperback there's a pull out with common carb values that I keep in my daily food log. I also jot down carb values for the normal stuff I eat and keep this list in the log. Many times I can plan the meal before I start and count the carbs as I decide what I'm going to cobble together.

I also refer to these two sites often:

Carbohydrate chart

Atkins carb counter