AppSmashing amongst other things is a cool way of improving workflow with iPads. Put all too simply it is about taking different apps and combining them to produce something different.
As Mark Anderson so eloquently puts it in his blog (http://ictevangelist.com/appsmashlive-review-write/) you create a new learning outcome that is greater than the some of its parts.
App Smashing when done well has the potential to develop higher order thinking skills and redefine some aspects of learning through the use of digital technologies (SAMR)
The YouTube link above is a live mash-up with some of the leading lights in this area: Richard Wells, Joe Dale, Jenny Ashby, Mark Anderson and Michael Ha.
Watch it in your next cover lesson :o)