Apago this week released PDF Shrink 4.2, a Mac OS X utility for reducing the size of PDF files. PDF Shrink optimizes the content and structure of PDF documents, making them easier to use in email attachments, on the Web, for on-screen reading, for document archiving, and more. Free to registered users of PDF Shrink 4, the update adds the ability to process entire folders of PDF files and improves compatibility with Mac OS X 10.5 Leopard and Adobe Acrobat 8. Apago is demonstrating PDF Shrink and its professional companion product, PDF Enhancer, at the Macworld Expo (booth #W-4336). According to the company, PDF Shrink can reduce most PDF files--including those created by Mac OS X iLife and iWork applications, Adobe Creative Suite, and Microsoft Word and PowerPoint--by as much as 90% of their original size.