Oregano (Origanum vulgare) is widely used in Mediterranean cuisine, and is often associated with pizza.
It has a warm, strong aroma, and it's used mainly as a dried herb.
It's used in mexican cuisine, also perfect for tomato dishes, and it can be an ingredient of the
bouquet garni.

Similar to oregano, Greek oregano has a stronger aroma and white, smaller flowers.

Some oregano recipes on 'Erbe in Cucina' (Cook with herbs):
Grilled Sword Fish with HerbsVegetarian 'Pizza Capricciosa'Piri Piri Pepper Cheese SauceGreen Purslane SaladThree Cheese Sauces from Ancient RomeHerbal vinegarAromatic Herbs CheeseAnother pizza recipe:
Quick Pizza on 'Il Meglio in Cucina - Best Cuisine'
Oregano recipes from the blogworld:
Cabbage Salad with Lime and Fresh Oregano from Gluten-Free Bay
Chicken Soup with Garbanzos and Oregano from Kalyn's Kitchen
Greek-Seasoned Grilled Pork Chops with Lemon and Oregano from Kalyn's Kitchen
Grilled Tomato & Oregano Fougasses from Daily Unadventures in Cooking
Herb Focaccia from Living in the Kitchen with Puppies
Italian Meatball Burgers from Culinary in the Desert
Oregano Ravioli from Living in the Kitchen with Puppies