Gullerbutry on RPG.net apparently came up with a "triangle" table that is absolutely one of the coolest things I have ever seen.
I have been trying to figure out a "FATE-like" way of doing a set of random exploration tables, and this just might be the trick I was looking for (laying out the results on a standard -4 to +4 doesn't have enough slots and yields wonky results). This, possibly taking his suggestion to include blanks instead of ignore them, is freaking awesome. I like this Gullerbutry guy.
You can read the thread here and grab a form-fillable PDF here to take a look for yourself.
EDIT: Swiped a probability chart from Glyptodont: