If you have multiple webcam or video cameras and want to save at the same time, use IPI Recorder.
IPI Recorder is a tool for recording multiple videos. It works with DirectShow ie with webcam with USB and Firewire. It uses technology from Microsoft's ClickOnce deployment then installation works only from IE browser.
During its operation, the user can choose the codec and resolution of the video. The video is stored in one file and video images from several cameras side by side.