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 Ppt To Pdf 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.
For a slide-formatted PDF to PNG, 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 free tools before moving on to the more costly solutions. The PNG images generated by the tools do not display well; they are too small: The image above was generated with Photoshop, then opened as Adobe PDF on a Mac using the tool included with it. Another option is, if you have an Adobe Reader installed, use it to generate an .pub file, which opens nicely in the Reader. The PNG files generated by the tools work fine in my Adobe Imagery Reader on a PC using a Windows Vista Home. Then I drop the image directly into my slides and the images display as projected slides.