Camtasia Studio

Camtasia Studio is by far the best screencasting software - its currently available only for Windows though a Mac version of Camtasia is under development.

Now a full retail version of Camtasia Studio 5 costs $300 but you can have Camtasia for free.

The only catch is that this offer is available for Camtasia Studio 3. Download the demo of Camtasia Studio 3 here and then request a registration key from Techsmith here to convert that demo into a full licensed version.

1. Install the cover mount disc that includes Camtasia Studio 3.1.3.
2. Select Camtasia Studio from the list of programs.
3. A Camtasia Studio Evaluation window will open. Select I have a Software Key.
4. Type in your name and software key:like this
   XCFFK-ZZ4KW-SNV4Y-CPHHF-NF769.

Though you may miss some of the new features like Auto Pan and Zoom, Camtasia Studio 3 will still solve most of your screencasting problems - also includes quizzing, titles, PIP and support for recording PPT presentations.

Once you download a free copy of Camtasia Studio 3, it can be upgraded to Camtasia 5 edition at half the standard cost.

Tutorials here