Some folks looked at my last post of the Judges Guild Universal Probability Chart and they discovered that it was just as quirky as you'd expect from a Judges Guild product.
I still think the chart is a good one, so I made one myself.
The probabilities for 3d6 are "generous" at the extremes, but I don't think that hurts too much. I'll probably use it for NPC attributes and/or damage rolls.
I made this using my best judgment and I think it's pretty close -- certainly close enough for my DM'ing style. YMMV.
PS: my Bears are out! :( It looks like we're heading toward a Packers/Steelers Superbowl. It aught to be great!