Enter to win a three-month gym membership, a stability ball, and a yoga mat from 24-Hour Fitness; and an Essential Sackpack, a Cafe Ribbed Tank, Cafe Capris, Gel Harami Sneakers, and Kayano II low-cut socks from Asics!

To enter, upload a head shot that shows off your hair the best below, or send your photo with your name, address, birth date, and telephone number to: Seventeen Best Tressed Contest, 300 W. 57th St., 17th Floor, New York, NY 10019. (Group pictures, prom photos, and images of pets or celebrities will be disqualified.)

If you have a friend who deserves to be one of the Best-Tressed Girls in America, forward this page to her so she can enter!

Enter to win a $130 gift certificate from debshops.com!

Enter to win a $100 gift certificate to GoJane.com!

Enter to win a $200 gift certificate from JCPenney!

Enter to win a DVD of Mamma Mia!

Are you making a powerful impact and changing your world for the better? If so, enter to win a $1,000 scholarship!

To enter, upload one photo of yourself, one photo illustrating your volunteerism efforts, an essay about what you're doing to make a difference in your school, your community, or your world (no more than 250 words), and either one newspaper clip about your achievements, a certificate of award, or one personal letter of recommendation. Note: All entries not meeting these requirements will be disqualified.

Enter to win the entire cosmetics collection from Physicians Formula's green line, Organic Wear!

Enter to win this dress from windsorstore.com!

Enter to win a Zune Originals player custom designed to your zodiac sign!

Zune Originals has released the Zodiac Series, its first themed collection of designs that features 12 Western astrology signs created by Catalina Estrada, a Colombian artist best known for her use of symmetrical patterns and vibrant colors.