On Google Groups, the AdWords API Advisor shares some videos and useful documentation on how to get the most out of the Google AdWords API. The documentation as provided by Google is at the AdWords API tutorial page, and there are 9 videos that can be viewed at your convenience to get more. They are:

An introduction to the API and how you can use it
An intro to web material within the API
How to log into the API sandbox development environment
How to capture debugging behavior
Creating campaigns around the API
Creating ad groups around the API
Creating ads around the API
Creating keyword criteria with the API
A discussion about the AdWords API

Very cool stuff. The videos are very informative.

Forum discussion continues at Google Groups.