There are many wonderful videos online expressing sociological themes and concepts. One recommended video is Silent Beats, a short 6-minute YouTube video about people's assumptions and stereotypes.
PBS has many great videos online. For a general listing of all of their program video sites, see the PBS video site. For video of specific PBS shows that offer many videos of interest to sociologists and sociology students, see the following:
Some of the TEDTalks are of great interest to sociologists and sociology students. Click HERE to watch sociologist Sam Richards' talk titled "A Radical Experiment in Empathy." There are more than 900 videos of TEDTalks available free on the TED.com website.
You can find a wide assortment of thought-provoking debates at the intelligence squared website. When you get to the website, click on "Enjoy Past Debates" at the top of the page to see the long list of debates you can watch or listen to.
You will find some very thoughtful sociological analyses of videos and other images at the Sociological Images website.
There are many free videos online at http://www.ucsd.tv/ondemand/ Scroll down on the page that's linked and you will see all of the topics they offer. Here is a list of just some of the categories that have some videos of interest to sociologists:
Law and Justice
Religion and Politics