Samsung has an Interactive Guide to HDTV that is one of best, most complete, information sites on the web; complete with lessons and tutorials. Whether you are new to HDTV or looking for additional information, this site is a must in my opinion.
http://product.samsung.com/cgi-bin/nabc/campaign/dtvguide/index.jsp
http://product.samsung.com/cgi-bin/nabc/campaign/dtvguide/index.jsp
