Other
Tulane University: Physical Geology: Glaciers and Glaciation
Lots of information here about glaciation, types of glaciers, the formation of glacial ice, changes in glacier size, how glaciers move, glacial erosion, landforms produced by glaciers, glacial deposition and drift, effects of glaciation...
National Snow and Ice Data Center
National Snow and Ice Data Center: All About Glaciers: The Life of a Glacier
Explains the conditions needed for glaciers to exist, how they begin to form, what causes them to flow, and why they may retreat.