Software

FareCatcher
Charityware from Spitting-Image Software. Proactively goes to the web to retrieve the lowest price fares for trips on the dates that you request.
http://www.spitting-image.com/products/farecatcher/

PlanetWare Travel Encyclopedia
Offers searchable tourist attraction data and an encyclopedia. Plan travel using 3,000 photos, 2,000 maps, and 50,000 descriptions.
http://www.planetware.com/

Time Traveler
Class Action provides handheld computer software for business travelers.
http://www.classactionpl.com/