Tilt-zoom gives you a new way to zoom within the browser and picture gallery app, whereby you tilt the phone up to enlarge an image or down to shrink it.
It turns out that you can dump the image files (JPG only) anywhere in the file structure of the player and view them using the Browser, but if you want to take advantage of the built-in slideshow-type navigation features (which aren't that great, anyway) you have to put the files into a specific spot.