SmileOnMyMac has released PDFpen 3.3.1, its PDF editing and form-filling tool for Mac OS X. The update adds two Leopard-specific fixes, better element positioning, and improved handling of off-spec PDFs. All the new features of version 3.3.1 have also been added to PDFpenPro 3.3.1, the Pro version that has the ability create fillable PDF forms in addition to all the features of PDFpen. [ Price: from US$49.95 ~ Requires: Mac OS X 10.4 or later ~ Leopard support ~ Free trial available ]