We recently put the following list together for a longtime client. We thought others might find it helpful as well. Let us know if you have other resources so we can share with others.
Sage has their Sage University website. This link takes you directly to Sage100 resources.
Sage City is a user focus forum sponsored and maintained by Sage. You can ask questions or read questions and responses by others.
Sage Knowledgebase is also available to you.
Sage 100 ERP Documentation Channel