The Logitech C525 Webcam is a stand alone portable webcam that is compatible with Windows (Windows XP SP2/SP3, Windows Vista, and Windows 7). It comes embedded in a foldable contraption that you can "clip" on a monitor or similar.
Lightweight; small; flexible; good microphone; inexpensive; decent picture for price
Software hiccups; I could not turn picture; picture quality could be better