When I recently moved up to a new computer running Win7/64 bit for my engineering work I elected not to upgrade my expensive Adobe Acrobat Professional. Instead I installed and use the PDFCreator program that comes for free through SourceForge. That program works well as the "printer driver" for creating PDF files as the print output from other applications. One thing lost when using this approach is the ability to manage PDF files after they have been created doing such functions as page insertion, deletions and page rotations.
What tools have you found to manage these functions in PDF files that fit in the "free category"?