USGS: Map Projections
Map Projection Basics
The Geographers Craft: Map Projection Overview
BC: Map Projection Tutorial
Map Projections Exercise (Univ. of Texas @ Austin - CD 394K.3 GIS Class)
Universal Transverse Mercator (UTM) Grid
The State Plane Coordinate System (Source: Colorado State)
State Plane Coordinate System (Source: GIS Lounge)
SICOM: Spatial Coordinate Systems
Projecting Data in ArcView
Projection and Datum FAQ: The SeisSoft Company
more to come!