You can select portions of a media clip to be used in your project by selecting the clip from your timeline and adjusting the gray slider in the clip editor to change the in/out points.
You can make an instant image slideshow from Flickr by selecting the clip and changing the dropdown from "Single Image" to "Flickr Slideshow."
You can turn off the audio or video of a media clip by selecting the clip and hitting the off switch in the clip editor on the right pane. This comes in handy for using music or voiceovers from YouTube.
You can add Google Streetview for your viewers to interact with. Select the Googlemap event and change the Map Type to "Street View."
You can add 3D models for your viewers to interact with by adding a 3D model event from the events menu and pasting in a URL from sketchfab.com. Your viewers can rotate the model during playback by clicking and dragging it with their mouse.
You can resize media clips on the stage by selecting the clip and dragging the handles.