I'm glad I'm not the only one who does this, though for me it was mustard. I just kept buying mustard every week or two for a few months, each time forgetting that I had some in the cupboard!
I just had my oatmeal with peanut butter and it was very good that way. The Jif peanut butter company runs a peanut butter sandwich contest:http://www.jif.com/promos/contest/default.asp
If you scroll down, you can see the winning recipes. Some have meat, so if you are a vegetarian, those won't work, but many don't. (And if you are an omnivore, figuring out a way to use peanut butter with meat might be good!)
Peanut noodles are another good use for the peanut butter. You can find a lot of recipes online and in cookbooks for sesame noodles with peanut butter, or just use a peanut sauce recipe. I searched on epicurious for you and found this one, as a sample idea:http://www.epicurious.com/recipes/food/views/101974
You could also make gado-gado (Indonesian vegetables with peanut sauce) found a sample recipe here:http://www.globalgourmet.com/destina.../gadogado.html
Or African or southern U.S. style peanut soup--oops, looks like someone posted a tested recipe for that.
With eight jars of peanut butter, you probably want to store some in the fridge.