Adobe's PDF format has become commonplace as a replacement for paper, but unless you own the full Adobe Acrobat package, you can't do much more than read and print PDF files. For a number of standard tasks that you'd expect to be able to perform with paper, that can now change with PDFpen from SmileOnMyMac; it's a utility that enables you to edit PDF files in several useful ways. PDFpen lets you insert and remove pages, move pages around in a document, and copy them between documents. You can also overlay text, images, and even freehand drawings on top of PDF documents, and you can even keep a library of frequently used items for fast access. Now you can easily add your signature to PDF documents and return them via email (or SmileOnMyMac's Page Sender fax software) without having to print a document just to sign and fax it back. PDFpen is also fully scriptable and comes with a variety of example scripts that show how to perform actions like adding page numbers to a PDF document. PDFpen requires Mac OS X 10.2.5 or later.