Grasshoppers in the Field and Garden - University of Nebraska Cooperative Extension in Lancaster County factsheet on grasshopper control in field and garden.
Orthoptera Species File Online - A searchable database of information on the world's species of grasshoppers, locusts, crickets and katydids, both living and fossil.
Orthopterists' Society - The purpose of the society is to facilitate communication among people interested in Orthoptera (grasshoppers, crickets and katydids).
Singing Insects of North America - Includes complete systematic checklists of the crickets and katydids of America north of Mexico, family descriptions, images, sounds, and identification keys.
Sound Signalling in Orthoptera - Research by David Robinson and Marion Hall on mating systems, songs and signals, hearing, analysis and the information content of signals. [PDF]