FutbolMom, there are so many uses! I love my lavender I planted last spring. I did three varieties, so there would be different purples and greens. First use is the most obvious - great bouquets to fill your home with scent. Then, you can dry them and keep all the little purple flowers for various uses, such as filling sachets, keeping out like potpourri (I have a big ironstone bowl of it out right now), or using for your cooking. Make sure you don't spray any pesticides!
Another use is a birdfeeder - there are tiny yellow birds that frequent my lavender heads, now that they've gone to seed. I started deadheading the plants till I saw many of the little fellows having meals. Now, I'll wait a while longer.
Here's some more info for you:
Lavender, Lavender Flower, Cooking with Lavender, Lavender Recipes, Culinary Lavender