I’ve just spotted another instance of Woopsi being used for a real application:
It seems to be a viewer for GPX data, which is apparently a file format for exchanging GPS information between different devices.
Looks pretty good. From the screenshot, it looks like the author has got the ScrollingTextBox, ListBox, Button and TextBox gadgets working, and has wired up the events to make it all work. No binary to play with as yet as it hasn’t been released for general consumption.