A tool coming to the latest versions of video editing applications is support for seamless transitions. Picture a scene showing people at a beach, and suddenly the sky zooms in and your in Rome or Paris, but it looks like you're in the same place because the transition glued the two scenes together using the sky. There are plenty of other examples of seamless transition; this magnificent video shows a good selection of them, and is partly responsible for starting the trend.
I test each service's prominent features, but it's up to you to decide whether or not you need dial-in numbers, VoIP, or both options for your audio, and whether or not you need video calls in addition to screen sharing. Some services offer both teleconferencing with dial-in numbers (local or toll-free) and VoIP calling, while some offer just one or the other. A few offer international dial-in numbers. Adobe Connect doesn't offer teleconferencing at all but can be integrated with a number of other services. Most offer video calls via webcam, although a few don't.
This great video editing app for iPhone takes you back to old times. You transform the video into a variety of vintage film styles with many combinations to choose from: black & white, sepia, color, vintage sepia, 20's movie or 60's home video, etc. You can speed up or slow down the videos. And several sound options like Video, Piano 1, Piano 2, Movie Projector, etc. are provided to add more feeling to your movie.