I just saw this yesterday. This guy (http://www.khanacademy.org/) started making videos to help his younger cousin learn algebra. Apparently he didn't know when/where to stop. Now he has over 1200 videos and receives something like 40,000 views a day. This has become his full time job! The implications of this whole story are pretty cool. They're both practical and mind-blowing.
On the practical side we have this huge library of videos we can use with our students. I haven't looked at all of them, but the ones I have looked at are pretty straight forward presentations that get right to the point of a lesson/standard. I wouldn't be surprised to learn that he starts with the standard and then builds a lesson to teach it. Most of the videos are 10-20 minutes in length and offer something a traditional lecture does not. The ability to pause and/or rewind without having to raise your hand and admit that you're "stupid".
Amazon starting under $70. I'm not sure what program he uses for writing on the screen, but I've been playing with one called Uniboard, which offers a free version and allows you to record.
Or, if you have a camera that can record video you can also just set it up pointed at your hands and use a pencil and paper to compose your lessons. In any case you too can easily make videos and upload them to YouTube (or some other school friendly site) for your students, and it doesn't really take that much time.
The other mind-blowing aspect is that this guy was able to create these videos and in the process create his own career. Not only will he have donations and ad revenue to support him. I'm sure he'll be doing the lecture/keynote circuit. Yet another example to support Malcom Gladwell's assertions in Outliers (great book by the way). Kahn was in the right place at the right time, has ability (BS in Math from MIT), and was willing to work hard. He leveraged the internet and built a career literally from his own effort and intellect.