The three seminars that were previously mentioned by this post are no longer available. David Sparks at Macsparky.com talks about his book iPad At Work. The book is available at Amazon.com. There are 24 chapters that cover everything possible for using an iPad in a working environment. This book is a derivative of his earlier book Mac At Work.
Apple often provides online seminars for similar products. The iPad at Work seminar by Apple can be found here.