RTMPDumpHelper is a small utility that can help you to easily download RTMP video/audio streams. By combining this utility and the proxy server of RTMPDump toolkit, you can simply open a Web page containing RTMP video stream in your favorite Web browser, and while watching the video, it'll be saved to your disk automatically as .flv or .mp4 file.
RTMP is a streaming protocol used by Hulu, justin.tv, and by many live streaming Web sites.