Screencasting is basically making a movie of what’s happening on your computer screen. It’s usually used for how-to videos on computing, etc.
Here’s a podcast on screencasting at SirsiDynix. It’s the 13th one down.
Here’s a short little screencast on screencasting:
Here’s where you can get the program Wink that you need to do a screencast
Or just get it from Download.com
The program is easy and quite intuitive (and free) so just get your copy and