You could always try Reduced Fat peanut butter, but... BLEH. That stuff tastes awful. I'm a natural pb person too, I don't like the taste of the other stuff...
Anyway, the only other thing I could think of is to look at the product called Z Trim (do a google search). It's a fat replacement thing, you mix half of it with whatever product and apparently you can't taste the difference and it has no calories or whatever. I know you can use it in sour cream and creamy dressings and whatnot, but it might work for pb too? I have a friend who uses it and loves it. Worth a google search
