For slide-formatted pdf to ppt, I use a number of tools with varying results. Because the results are dependent on content -- as well as the initial setup of the ppt environment (backgrounds, etc.) -- I suggest you experiments with some of the free tools before moving on to the more costly solutions. For other than extracted slides ... I have not found an acceptable tool to automate the conversion of pdf files into PowerPoint. But I do use Pdf To Ppt Converter Professional to export graphics to individual files and to recognize text using OCR. Then I cut-and-paste the wanted copies into my PPT format. I do my footnotes as the last slide -- then I can use hand-outs, projected talk slides, or make the entire package available on the web.
Some additional reading: — The Digital Library: Digital Libraries: How Can They Help You Sell More? — Webcast: How to Use Online Lectures with PDF Presentations — What Are Lectures? — What Is Online Lectures? — Learning to Create Videos. — What is a Video? — Why Creating a Video Is a Great Idea for You.