PDF editing in Leopard: Almost like Acrobat

"Almost" means that the "Preview" application that comes standard with Mac OS X Leopard does most things that I would normally need Acrobat for. You can
  • rearrange and delete pages.
  • add notes and markup (customize the toolbar to get the corresponding icons).
  • edit notes and markup in existing PDFs (at the bottom of the sidebar, you can display the annotations and then select or delete them).