I had never heard of Jing before but I do have lots of experience with Skype. I think that a screencast is great because it allows others to see what it is that you are working on, on your computer. Often times it is much easier to show someone what to click on then it is to try and describe it to them and describe it's location on the screen. I love the idea that you can talk about it and see it with out being in the same room.
Skype is a great communication took because there are so many parts to it. I love the chat feature and the video chat feature. I also love that it brings people together that are literally a world apart.
Nine down, two to go.