Note 1: "SAVE TO PDF" only shows up when you press the appropriate key sequence.
Note 2: When you're saving a picture the menu item changes to "SAVE AS TIFF".
Note 3: You can press the keys after activating the file menu.
Note 4: See the comments for a no-menu method of doing the same thing!
Hope this is not a duplicate tip and that some might find it useful.
[Editor's note: You can also save as PDF from any print dialog box by selecting the "Output Options" dialog box, clicking the "Save as File" checkbox, and then selecting PDF (or PostScript) as the format.]

