I have used Skype several times in my classroom to give my students experiences to broaden their horizon. If you are interested in learning about other students and their corners of the world, Skype is a great tool for it.
I love technology, and acquire gadgets through mini-grants, PTO funds, bonus points, etc. I used PTO funds to purchase a webcam (Microsoft Life Cam) a couple of years ago, to replace a cheap webcam. This camera has a built in microphone. It has a USB plug with a flexible "stand" to form to the monitor, wrap around top of a smartboard, or clamp on a tripod. It has good sound quality, and can take still pics, video, or live feed. The program allows you to adjust the size of the display. I can generally show most of my classroom when I set it on the top ledge of the Smartboard. I also have an iPad 2 with built in camera/ webcam, but the students prefer the webcam/smartbooard set up because we can see our guests and see us.