I say Part I because I'm certain I've missed some and more will be added... so PLEASE comment if I've missed one and I'll edit the post to include... please be sure that it focuses mainly on NXT.
www.mindstorms.com
www.legoeducation.com
http://mynxt.matthiaspaulscholz.eu
http://legoeducation.typepad.com/
http://www.nxtasy.org/
http://www.bnxt.com/blog/
http://www.jstuber.net/
http://www.hitechnic.com
http://www.philohome.com
http://www.ortop.org/NXT_Tutorial/
http://www.nxtbot.com/
http://www.nxtclub.com/
http://www.mindsensors.com/
http://www.rifagent.com/
http://www.vernier.com/nxt/
http://mindstormsnxt.blogspot.com/
http://www.brick-labs.com/
http://robotchallenge.blogspot.com/
http://www.nxtidea.blogspot.com/
http://nxt.natulte.net/
http://www.nxt-mindstorms.com/wiki/Main_Page
http://www.themaurinet.info/mindstorms
http://bricxcc.sourceforge.net/
http://www.astolfo.com
http://www-education.rec.ri.cmu.edu/robotc/
http://www.ni.com/mindstorms
http://www.legoengineering.com/
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=176190
http://bricksforbrains.geekytom.com/
http://www.fll-freak.com/index.htm
www.mindstorms.com
www.legoeducation.com
http://mynxt.matthiaspaulscholz.eu
http://legoeducation.typepad.com/
http://www.nxtasy.org/
http://www.bnxt.com/blog/
http://www.jstuber.net/
http://www.hitechnic.com
http://www.philohome.com
http://www.ortop.org/NXT_Tutorial/
http://www.nxtbot.com/
http://www.nxtclub.com/
http://www.mindsensors.com/
http://www.rifagent.com/
http://www.vernier.com/nxt/
http://mindstormsnxt.blogspot.com/
http://www.brick-labs.com/
http://robotchallenge.blogspot.com/
http://www.nxtidea.blogspot.com/
http://nxt.natulte.net/
http://www.nxt-mindstorms.com/wiki/Main_Page
http://www.themaurinet.info/mindstorms
http://bricxcc.sourceforge.net/
http://www.astolfo.com
http://www-education.rec.ri.cmu.edu/robotc/
http://www.ni.com/mindstorms
http://www.legoengineering.com/
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=176190
http://bricksforbrains.geekytom.com/
http://www.fll-freak.com/index.htm