Using video is a great way to promote your workshop or seminar on YouTube. I found this video by Chris Hamilton at http://salestipaday.com and he gives a real quick overview of how you can turn your registration page into a video using Keynote or Powerpoint.
Powerpoint 10 has a video recording feature built in, but you can also use Camtasia or http://screencast-o-matic.com.
The more ways you can let your audience know about your event, the better, so be sure to promote your video on your blog, as well as on all the social media, like Twitter and Facebook.
Take a look at this video and let me know how you are using video to promote your events in the comments.
By the way, if you want to use more video in your marketing or delivering of your services, check out Bob “The Teacher” Jenkins’ upcoming Simple Video Velocity in Orlando.