I've recently been making couscous a lot and this is the simplest recipe I use on the net.

Simple and quick couscous is flavored with sun-dried tomatoes, green onions, and basil. This dish may be served hot or at room temperature. Use store-bought vinaigrette or make your own.

Prep Time: 10 minutes

Cook Time: 5 minutes

Ingredients:

• 1/4 teaspoon dried garlic powder
• 1 package (10 ounces) plain couscous
• 1/2 cup sun-dried tomatoes (preferably oil-packed), drained and diced
• 1/4 cup sliced green onions (scallions), tops included
• 2 Tablespoons minced fresh basil
• 2 Tablespoons extra virgin olive oil
• Salt and freshly ground black pepper to taste

Preparation:

1. Heat water to boiling and stir in garlic powder. 
2. Place couscous in a large heat-proof bowl.
3. Stir in garlic broth, cover, and let steam for 5 minutes until tender.
4. Fluff with a fork and gently stir in sun-dried tomatoes, onions, basil and some extra virgin olive oil.  
5. If I'm having it cold, I tend to add some balsamic vinegar.  
6. Season to taste with salt and freshly ground black pepper. 
7. Fluff again with a fork and serve hot or at room temperature. 

Source: http://homecooking.about.com/od/pastarecipes/r/blpasta17.htm