Official Sites:

Barbie.com
Mattel's official site for Barbie, with product information and activities for girls.

BarbieLatina.com
Mattel's official site for Barbie, en Espanol.

Barbie Collectibles
Mattel's official site for collectible Barbie dolls, with information for collectors. Also features an online store and the Collector's Club.

Kelly Club
Mattel's official site for Barbie's younger sister Kelly. This site is aimed at younger girls, and includes online activities.

My Scene
Mattel's official site for the My Scene Barbies. Includes fashion trends.

Pages on RTM:

Barbie Finds a New Boyfriend
A June 2004 press release announcing that Barbie has chosen Blaine as her new boyfriend.

Barbie as Daphne
The RTM Spotlight section looks at the Barbie as Daphne (from Scooby Doo) doll, with information and pictures.

Barbie Doll History
An April 2002 press release from Mattel, giving a brief history of the Barbie doll.

Barbie Fun Facts
An April 2002 press release from Mattel, listing tons of interesting tidbits of information about Barbie.

Malibu Barbie Is Back
A May 2002 press release from Mattel, announcing the reproduction edition of 1971's Malibu Barbie.

Elsewhere on the Net:

The Barbie Doll Start Page
About.com's Guide to Doll Collecting helps show you the online world of Barbie collecting.

Barbie Hall of Fame

Barbie: Image of Us All (History and Commentary)

BBoop's World

Bruce Nygren On The Web

Chatty Deb Dolls 'N More

DollPage.com

Kitty's Collectibles

Sandi Holder's Doll Attic