I've been trying to start on videos[1] because I also feel it's got a lot of potential reach. Even though the view numbers are significantly lower on my videos than my blog, I get many more emails and comments about the videos. I guess people respond better to a face and a voice than to text.
It's definitely something I'll be putting significantly more time toward exploring in the new year.
[1] About 30 videos up so far at http://youtube.com/robfitzpatrickable