http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Creating_point_features_at_intersections
http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Converting_vertices_to_point_features
http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Snapping_points_and_splitting_lines