Well, I'm a type 2, but I do use insulin, so I will answer this anyway, cause I think this is actually important information for everyone to understand about themselves. My answers may differ markedly from an insulin sensitive type 1.
200 lbs: 1 gram of carb raises me 2-3 mg/dl.
I call this my Carb Factor (CF). If you look through the math behind systems like those discussed in "Using Insulin" and "Think Like a Pancreas," this carb factor can be calculated. Given your Insulin to Carb Ration (ICR) and your Insulin Sensistivity Factor (ISF), you can calculate
CF (mg/dl / gram) = ISF (mg/dl / units) / ICR (grams / units)
I use an ICR of 5 and an ISF of 10 to 20 (I'm insulin resistant), and by calculation, my CF is 2-4 mg/dl/g.
ps. Bernstein suggests that 1 g of carbs typically raises the blood sugar of someome with T1 5-10 mg/dl.