Wikipedia has some entries worth reading -

http://luminous-landscape.com/ - a wide range of essays and information on analogue and digital photography

http://www.apug.org/ - Analog Photography Users Group - for those who love the traditional technology

http://www.daguerre.org/ - one of my favorite media - the daguerreotype

http://www.alternativephotography.com/ - old and forgotten photographic processes

http://www.pinholeresource.com/select_images.html - lensless photography


photo galleries

on the web have a look at http://www.photoblogs.org/ - a listing of photoblogs (mostly very clichéed and with little to say, though some have high production values)