I buy the frozen jumbo deveined shrimp all the time. Like a previous poster said, it's fully cooked, you just need to heat it up a bit if you want it hot.
I love shrimp scampi over linguine. If you are watching your refined carbs you can have it over salad, or by itself. This is a good recipe.
http://www.foodnetwork.com/food/recipes/recipe/0,,FOOD_9936_27383,00.html
Just add the thawed shrimp at the last minute to heat it up. You can cut back on the butter, and the recipe I use doesn't use white wine, just use more lemon juice if you want.
This is another good recipe I do all the time--
1. warm a tablespoon of olive oil
2. add 2 or 3 cloves of minced garlic-careful, don't burn the garlic
3. 2 14 oz. cans of diced tomatoes
4. Handful chopped fresh basil
5. salt and pepper
6. Heat the shrimp in sauce
7. Serve over pasta or rice, or alone.
Lori