Download: The True Story of the Internet is a four-part documentary series hosted by John Heilemann about the modern (post-ARPANET) history of the Internet, in particular the birth of e-commerce.
The four episodes are (according to Wikipedia):
I caught this show by chance on Discovery Science recently, and found it fascinating. If you are interested in the birth of e-commerce and some of the largest names on the Internet today, it is well worth a look. The DVD boxset is available on Amazon.com here: Download: The True Story of the Internet
You can also find out more about the show on the Discovery Science website here: "Download: The True Story of the Internet" - http://science.discovery.com/tv/download/download.html
Updated 2021 : note that the above post was originally published in 2010, but is left here for archival purposes. The link to the Discovery Science website is now dead, so I have unlinked it.