Here's what Dr. Davis says on his blog (emphasis mine):
What are ideal blood glucose levels?
From the above discussion, you can see
that a perfect consensus does not
exist. It is also clear that risks
from both fasting and postprandial
glucose are continuous with no clear
cutoff between no risk and the
beginning of risk. However, for our
working purposes, the data suggest
that ideal fasting blood glucose is 90
mg/dl or less; one-hour postprandial
100 mg/dl or less. At the start of
your program, before weight loss,
exercise, and the improved insulin
responses of the Track Your Plaque
diet have taken hold, one-hour
postprandial blood glucose of ≤110
mg/dl is a good starting point.
Long-term, ≤100 mg/dl is a better
target that likely provides maximum
plaque control and reduction of risk.
My fasting level is about 90; when I eat paleo, my post-meal bg stays about the same. Then there was the time I ate a Big Mac and fries right after the holiday and spiked a 157. Yeah, sometimes this testing can be useful even for the non-diabetic!
I'm going mostly low-carb now, but plan to see how I respond to starchier veggies soonish.