MikeAnimate
Liking YTtalk
I'd recommend wevideo.com. It's quick and easy video editing on your browser and they offer some cool-looking transitions, text, and filters. Easy peasy!
I have heard that Song Vegas or Adobe Premiere was very simple to use. But this all varies on what you're editing, such as a short movie or video blog. Final Cut is what I use and love editing on that. For beginners though, I say imovie, in my humble opinion.