This new version gives you the option to add photographs and other images to activities in your itinerary. Photos are copied into your trip and displayed inline with the times, names, and descriptions of all the activities in the trip.
Printing trips has been improved to use a new cleaner layout that includes the new activity photos along with all location and trip photos.
Finally, with Knapsack 2.2, you no longer have to unschedule a trip to modify the number and order of days in your trip — even if the trip is sync’d with iCal.
You can read all about the details in the release notes.