big list....
Industry related stuff:
http://www.aphotoeditor.com/
http://www.wonderfulmachine.com/blog/
Photographers:
http://evankafka.com/sensorsensibility/ - Evan Kafka, commercial & editorial
http://photography-thedarkart.blogspot.com/ - Drew gardener, fashion & editorial
http://www.joemcnally.com/blog/ Joe Mcnally, one of the most respected editorial photographers alive
www.zarias.com - Zack Arias, Music, portrait, editorial etc
http://blog.chasejarvis.com/blog/ - Chase Jarvis, advertising
http://www.moosepeterson.com/blog/ - Moose peterson, wildlife
http://www.larajade.co.uk/blog/ Lara Jade - fashion
http://www.joeyl.com/blog/ - Joey L - editorial
http://jeffascough.typepad.com/ - Jeff Ascough - weddings
http://visualsciencelab.blogspot.com/ kirk Tuck
http://www.davidbergman.net/blog/ - David Bergman, editorial + sports. Awesome behind the scenes video: http://biSPAM/cb5bDm
http://blog.tombarnesphoto.com/ - Tom Barnes, music + bands
technical gumpf and collections:
http://guessthelighting.com/ features photos and deconstructs the lighting
www.strobist.com great resource on lighting, especially with small lights
http://blog.pocketwizard.com/ features photographer's work
http://blog.profoto-usa.com/ features photographer's work
http://vervephoto.wordpress.com/ Featuring new documentary photographers
http://www.bbc.co.uk/blogs/photoblog/ BBC news photo editor's blog
http://www.aphotostudent.com/ more critical + theory stuff from a photo student.
http://lens.blogs.nytimes.com/ features some awesome news photos
http://www.boston.com/bigpicture/ weekly collections of news photography from big stories around the world
just adding some more too...
some more:
http://boardingarea.com/blogs/flyingwithfish/ flying / photo travel
http://www.asmp.org/strictlybusiness/ photo business
http://fstoppers.com/ various photo stuff
http://photobusinessforum.blogspot.com/ photo business
http://www.sportsshooter.com/ periodically browse sports shooter, loads of good stuff even though I don't shoot sports.
use google reader to grab the feeds from all these... skim, otherwise there'd be too much to read everything. Lots of good stuff out there, edit it down to stuff relevant to your interests. Doubtless click lots of links to other people's blogs / pictures on twitter etc.