My husband is into smoothies lately and I found this great site that just has a ton of great smoothie recipes called Smoothie Recipes. Personally my favorite recipe so far is the Strawberry Sunrise Smoothie:

8 ounces carton vanilla yogurt
1/2 cups frozen strawberries
1/4 cups apple juice
1 frozen banana, chopped

Place all ingredients in a blender, cover and blend until desired consistency. Serves 2. Note: this is a good way to use up bananas that are about to get overripe. Don’t let them go too far though. While still tasty, cut up and place on wax paper on a flat dish or pan that will fit in your freezer. As soon as they are frozen, dump into a zipper freezer bag. Use for this and other banana smoothies or slushies.