I too like itasoftware and itn. The bad news is that ita does not have international (yet). ITN uses Galileo/Apollo as its fare engine, whereas travelocity uses Sabre. You might want to check both before doing a final booking.
Bizreservations is great if you want to see the fare for a specific itinerary, however it may not always find the best fares. I have had a couple of complicated international tickets that had the same itineraries but priced better on itn (when it could price it).
[This message has been edited by chipper (edited 02-19-2000).]