The entire LLT Productions The Seventh Day documentary is on YouTube, as narrated by Hal Holbrook. This is good material for those who are curious about the history of the Sabbath and the change from Sabbath to Sunday. It takes a while to view it all, but for those who are seriously interested, this would be a good thing for them to see.
The Seventh Day - Intro
http://www.youtube.com/watch?v=2Z52UDIyCoc
The Seventh Day - Part 1 of 5
http://www.youtube.com/watch?v=ZXzXWHtnQBM
The Seventh Day - Part 2 of 5
http://www.youtube.com/watch?v=sJ7FCxReGFA
The Seventh Day - Part 3 of 5
http://www.youtube.com/watch?v=4xeNRsWiZMw
The Seventh Day - Part 4 of 5
http://www.youtube.com/watch?v=c5mFfokDdSI
The Seventh Day - Part 5 of 5
http://www.youtube.com/watch?v=u_b8lo5slTU
List of people interviewed --
http://www.the-ten-commandments.org/sabbathtruthexperts.html