3D-Garage - educational videos and materials from Dan Ablan
VertexMonkey - collections of resources for Luxology's modo
IndigoSM - lots of really useful modo scripts by Seneca Menard
jj modoscripts - more great modo scripts by Julian Johnson
archvisuals - architectural visualization modo scripts by Dr. Neil Hayes
Null Institute - free modo tutorial podcasts
Modonize - modo knowledge base
modomojo - content aggregation site for all things relating to modo
Killer Slime - model shop and modo showcase
Nurbs and Polys - The 3D Modeler's Forum
CGSociety Society of Digital Artists - modo forum
Yahoo Tech Groups - modo forum
BAMUG - San Francisco - bay area modo user group