The real-time Webcam (http://www.nps.gov/yell then click on Photos & Multimedia) provides full motion video of Old Faithful Geyser, as well as other geysers located on Geyser Hill.
A five-minute audio message plays with the live video stream, providing information about various hydrothermal features in the park.
Full Story: http://missoulian.com/articles/2008/01/24/bnews/br53.txt