I was contacted by Seth Williams, who pointed me to this OBIEE training site - http://www.fireboxtraining.com/obiee-training, and asked if I would link to it. There is a an online tutorial, as well as a video, on how to create KPIs using OBIEE - How To Use KPIs | OBIEE Online Training Tutorial
I think this is useful, so am posting it to my blog - which, by the way, you would have seen is not being updated regularly. Feel free to browse to the site. Do let Seth and the people at Firebox know what you think of the site and the tutorial.
Disclaimer: I am not endorsing the site or the trainings. But you know that.