Editing PDFs in Preview
Beyond just copying and pasting text, Preview now offers light editing capabilities for PDF files. The ability to generate PDFs isn’t new; it has always been built into Mac OS X, first as a print preview feature and later as a complete printing alternative. The ability to modify an existing PDF, however, has largely remained the province of desktop publishing.
Leopard introduces full PDF editing capabilities (including adding comments) to Preview, making it a great entry-level PDF management tool.
Dictionary Wikipedia searches and grammar checking
Mac OS X’s systemwide dictionary has gotten a couple of subtle updates. It now offers the ability to look up phrases via Wikipedia as well as through its standard dictionary, thesaurus and Apple-related phrases dictionary. It also includes a grammar-checker in applications such as TextEdit that fully support the use of the dictionary.