Screencasting is a growing fad on the net. You basically record your computer screen activity together with narration & subtitling embedded. It is being used to great effect in a number of different genres.
At www.screentoaster.com a brilliant online software tool exists that allows you to easily create your own screencast content and upload it to the internet compressed to a very acceptable file size.
All you do is register and then hit start recording.
You'll have to tell it if you want to use a microphone or webcam - then use the ALT-S key to toggle recording on and off.
This really is insanely easy to use considering the power of the content you can produce - animated movies, audio-blogs, tutorial guides or entertaining spoken-letters to distant friends and family.
Take a browse round the site at what others are making - the list of possibilities is endless.