Learning a new tool is often a daunting task. However, if you take a little bit of time to go through the information on this page, you should be up and running with Pentaho Data Integration in no time.
These mini flash demos (based on older versions) contain no sound, just text, but are useful as well:
We will try to create more micro-demos like this, feel free to suggest topics in the comments.
Here are a few links to get you started:
Feel free to suggest more links for this area.