Just a short note but was something I had trouble finding. I wanted a web camera that worked with Skype under Ubuntu. I found the Logitech C270. It has a built in microphone and was truly plug and play.Just download and install Skype 2.1 Beta for Ubuntu, plug in your C270 and it just works. You will have to go into the microphone selection section and pick the mic on the C270 instead of your microphone port if you want to use the built-in mic.
Go to SYSTEM-->PREFERENCES-->SOUND then click on the INPUT tab and you can pick which microphone you want to use.The Logitch C270 has a hinge mounting system that is more suited to laptops than LCDs but with a small piece of Velcro it worked with my LCD just fine. The camera head can tilt so you can angle it up or down once you mount it.
The C270 has a very nice picture over Skype too. It is a 720P camera and seams to work nice even in my low light setting. Even using external speakers mounted on my monitor I noticed no feed back while using the cameras mic.
