Many colleges and universities offer online learning programs in GIS, including:
Vendors also often provide online training. Esri offers online training for specific software as well as on GIS applications, science, and technology. Several courses offer Continuing Education Units (CEUs) in conjunction with various colleges and universities. Sign up for a free module.
Keep up-to-date on the latest GIS software news and trends.
Wiki.GIS.com is an encyclopedia dedicated to geographic information systems (GIS). This repository incorporates contributions from the GIS community for the benefit of GIS professionals, students, and anyone with an interest in GIS software. The wiki contains informative articles about GIS concepts, new technologies, products, people, and organizations.
Visit the wiki.
A large library of free e-books can help you learn more about GIS.
Essays on Geography and GIS