Pokémon Diamond and Pearl

CCG: Pokemon Pearl
Unlockables, hint, and Game Boy Advance cartridge extras.
http://www.cheatscodesguides.com/nintendo-ds-cheats/pokemon-platinum/

GameFAQs: Pokemon Diamond
FAQs, cheats, saved games, reviews, and a message board.
http://www.gamefaqs.com/portable/ds/data/925601.html

GameSpy: Pokemon Pearl
Preview, screenshots, and cheats.
http://ds.gamespy.com/nintendo-ds/pokemon-platinum/

GameZone
News, screenshots, cheats, and links.
http://nds.gamezone.com/gamesell/p31420.htm

IGN: Pokemon Pearl
Screenshots, videos, previews, news, and a message board.
http://ds.ign.com/objects/707/707324.html

Nintendojo
Preview, by Christopher Dring: "With now 493 known Pokémon, the chances of catching them all has become pretty slim. However, Pokémon Diamond and Pearl is gearing up to be the most complete and well rounded entry into the series thus far." <small>(March, 2007)</small>
http://www.nintendojo.com/previews/NDS/view_item.php?1173903107