Do a search for ABT or turds and you'll find a wide variety of fillings. Basically, its usually cheese, meat and seasoning. The type of cheese and meat can be almost anything. Shrimp or crab meat work well.
BTW, if the japs are too hot, use a spoon or veggie peeler to get out all of the membrane and seeds, and cook them a little longer. That will tame the heat somewhat. You can also use baby poblanos if you can find them.
Here's a recipe that I tried a while back that came out very good. It is modeled after the Crab Rangoons that we get from the local Chinese carry out place.
Turd Rangoons
24 Jalapenos
8 ounces cream cheese
8 ounces fresh crab meat or canned crab meat, drained and flaked
1/2 teaspoon Worcestershire sauce
1/2 teaspoon light soy sauce
1/8 - 1/4 teaspoon freshly ground white pepper, to taste
1 - 1 1/2 green onions, finely sliced
1 large clove garlic, finely minced
1 teaspoon red onion, chopped
6 slices bacon, quartered
Mix all ingredients except the jalapenos thoroughly. Slice the stem end off of the jalapenos and thoroughly clean out he seeds and membranes. Stuff the jalapenos with the cream cheese mizture and top with 1/4 slice of bacon. Secure the bacon with a toothpick if necessary. Place in a rack to hold upright and cook until the jalapenos are to your desired doneness.
If you want a little extra heat, finely chop the jalapeno caps (minus the stems) and add to the filling. You could also slice the japs in half lengthwise and fill them and cook them flat.