Here's an in-depth video for a holiday weekend: A presentation from Kenneth Brill, Executive Director at the Uptime Institute, at the 21st Large Installation System Administration Conference (LISA '07) last November. In this 90 minute video (a 45-minute presentation, followed by questions), Brill speaks at length about the cost of power consumption in data centers in a message titled "The Economic Breakdown of Moore's Law." Check it out if you have time, or bookmark it for when you do.
NOTE: The slides Ken refers to in the video are available at http://www.usenix.org/event/lisa07/tech/brill_talk.pdf so you can follow along.
For additional video, check out our DCK video archive and the Data Center Videos channel on YouTube.