Updated for Safari 4
A special feature of Apple's Safari
browser is the ability to open PDF files directly in
Safari. In this tutorial, I explain how to work with
PDF files in the latest versions of Safari.
When you click the link for a PDF
file, Safari will open the file in the same window.
Note that opening a PDF file may take time, so be
patient while Safari opens the file.
Safari for Mac OS X adds a control bar for
PDF files but it is only visible when you move your
mouse to the bottom of the Safari window.

There are four buttons on the control bar (from left to right):
Once a PDF file opens in a Safari window, you can save the file to your hard drive by selecting Save As... from the File menu. A Finder pane will open and you can name the file and select a location on your hard drive for the saved PDF file.
When you right-click on a PDF page in Safari, you will see a long list of options.

The options let you save or print individual pages from the document, zoom in and out and resize pages and view the document as single or double pages. You can also select to open the document in Preview.