I made a to die for filling a couple weeks ago. I made a smbc and put a couple tablespoons of peanut butter right at the end....it was soooooo good. My hubby took one taste and said 'you keep this up I am going to gain a lot of weight'...lol I could find the exact recipe around here somewhere if you need.
I just tried the one on this list this weekend, and it's delish! It's by MacsMom :
http://docs.google.com/Doc?id=df4f9hbq_46cs9f28fs
Scroll down alphabetically to peanut butter.
I have one that my customers absolutely rave over-
beat 1/2 c. each peanut butter & softened butter, add 1 c. powdered sugar & 1/4 tsp vanilla & mix together.
it can be easily multiplied to fit your needs. try it, you'll love it!
did you know that if you add 3 tablespoons of flour to that recipe that it makes a perfect cookie. bake for approx. 10 minutes at 350. That is one of my almost flourless PB cookie recipes !!! 
you can also eliminate the flour and add 1/4 cup brown sugar and have flourless PB cookie.
i just add pb to my buttercream and its so good tastes like resses pb cups
I noticed that a lot of people are adding peanut butter to their buttercream. I actually add it to my cream cheese icing. It tastes just like peanut butter pie! Mmmmmm 
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