Animation links:
www.awn.com
www.happytreefriends.com

Animation festivals:
http://www.siggraph.org/s2006/
http://www.annecy.org/
http://www.animated-encounters.org.uk/
http://events.awn.com/index.php?ltype=type&sort=cfest
www.hkiff.org

Animation studios and companies:

http://www.aardman.com/
http://www.ntv.co.jp/ghibli/  (Studio Ghibli's official site, in Japanese)
http://www.nausicaa.net/miyazaki/ (Sit dedicated to Studio Ghibli, in English)
http://www.pixar.com/
http://www.dreamworksanimation.com/
http://disney.go.com/home/today/index.html

Resources:

http://www.sounddogs.com/start.asp  (Sound effects site)
http://www.stonewashed.net/sfx.html  (More sound effects sites listed here)
http://www.3dlinks.com/
http://www.stopmotionanimation.com/

Animation software companies and links:

http://www.blender3d.org/cms/Home.2.0.html
http://www.artofillusion.org/index
http://www.sidefx.com/  (Houdini software)
http://usa.autodesk.com/adsk/servlet/index?id=5659302&siteID=123112 
(3D studio Max)
http://www.alias.com/eng/index.shtml  (Maya software)
http://www.softimage.com/home/ (XSI)
http://www.toonboom.com/  (2D animation)
http://www.macromedia.com/software/flash/basic/  (2D animation, Flash)

http://www.stopmotionpro.com/