I used PowToon to create my defense for my IBL theme.  Not the easiest video-creation tool I've ever used, but it is capable of making some pretty powerful stuff.  I consider myself to be pretty skilled at video editing (I had almost eight years of community television experience spanning high school and college), but I'm not so good at animation.  This tool gave me animation tools while still functioning more like a video editor.  I don't like the price, but I do like the tool.