A couple of week ago a 28 year old naval engineer delivered his baby son based on watching some DIY YouTube videos. When I heard this news I realised that the DIY video's time had come and it wouldn't be too long before we see its wide adoption in organisations.
I've been a long-time user of screencasting technology such as ScreenFlow as a way of recording how to do things on your computer. As an example here is a 3 minute guide on how to establish a cash flow schedule in Salesforce.com.
Notice how I've preceded the instructions with a story that conveys why it's important to go through these steps.