I haven't done any videos yet, but I have a lot of ideas. I think educational videos could be a great way to market yourself by showing your knowledge and your personality. You could use powerpoints with a voice over, and mix in with video clips with you or clips related to the subject that you are talking about. Camtasia is a great video editing software that also allows you to capture recordings of your computer screen, voice recordings, or video recording from a web cam.
Listing videos could be more difficult, but doing them as more of a virtual tour of photo clips could work. Trying to take a video tour of a home might be more of a challenge. If the videos become too long, you will lose interest. Also, unless you are a professional, it is very difficult to take quality videos where the light is constantly changing as you are moving into different rooms. It may turn people away rather than draw them in. Short video clips (maybe 20-30 seconds for each location?) of the neighborhood, local amenities, or local events might be an excellent compliment to a virtual tour video.
I think deciding to go the video route is a big commitment. If you really want videos to work for you, you either need to be willing to post new videos frequently or already have a large library of videos. If I do ever make videos, I plan to post them as an enhancement to my blog rather than trying to create my own video channel.