GP32X.COM (The most popular and useful GP32/GP2x site. There is a great forum and downloads).
GPH (Commitment to Open Source, FunGP and Network Games has been GPH’s main objectives since the beginning, and it is still essential today).
Russian GP2x Community - The WIZ is your pass to Paradise (Russian GP2x-Wiz-Caanoo News Site).
the-nd.com - The nD is a new open indie handheld gaming device.