I've converted a number of my audio slideshows to mp4 movies, which are also iPad-compatible, and grouped them in a Vimeo channel. The channel is (obviously) called The Travel Photographer Channel....so this is a heads-up for TTP's readers to drop by and comment or "like" or whatever.
I prefer Vimeo to YouTube...I think its quality is better, and it seems to be more "serious" in its inventory of movies.