SmileOnMyMac has added new link features to PDFpen 3.1, its PDF editing and form-filling tool for the Mac. Users can now add, edit and remove URL and page links to PDF documents, features that were previously available only in the Pro version. In related news, the company also announced the release of a PDFpen retail edition. This edition is distributed by Dr. Bott and is available now at Apple Stores. The price, US$49.95, is the same as the download version. The box includes a CD and a Quick Start card.