How to save Tomato Seeds

For those who don't know how, here is a great video from Clifton Middleton on saving tomato seeds.
The video is 5 minutes long, if you can't view this gardening video here are the hightlights:

1. When choosing tomatoes for seeds choose the reddest and ripest.
   
2. Some of the seeds are green and some are yellow.
   
3. The green seeds are "not good" and they won't germinate.