*[http://gx4000.co.uk/ GX4000.co.uk], a new site devoted to the hardware and software of the oft-neglected games console.
*[http://grimware.org/doku.php Grimware] is a really nice site with hardware info and hacks for the CPC machines... give it a try!
*[http://www.khisanth.com/podcastThe Kilobyes Podcast] Home of the Kilobytes Podcast. Dedicated to playing chip tunes and covering the retro computing scene in general