1MovieSearch.com: 21 Grams: Summary and review.
Future Movies: 21 Grams: Review by Nik Huggins.
HARO Online: 21 Grams: Contains review and movie stills.
Internet Movie Database: 21 Grams: Contains plot outline, image gallery, trailer and news articles.
Mooviees!: 21 Grams: Features photographs, trailers, reviews, cast overview and synopsis.
Rotten Tomatoes: 21 Grams: Includes movie stills, reviews, trailer, news, cast and crew.
Yahoo! Movies: 21 Grams: Includes synopsis, trailers, production images, cast and credits.