SonicN

GameFAQs
Includes information, help, reviews, and a message board.
http://www.gamefaqs.com/portable/ngage/data/918288.html

GameSpot
Information, screenshots, links, movies, a preview, and a review.
http://www.gamespot.com/ngage/action/sonicn/

Open Site
Includes information and review overviews.
http://open-site.org/Games/Video_Games/Platform/Sonic_the_Hedgehog_Series/SonicN/