I’ve already pointed out that Adobe InDesign CS5 adds many small new features. Another such feature is the ability to set your starting auto page number in the New Document dialog box.
You’ll still need to create an Auto Page Number box on your page just as you always have, but prior to InDesign CS5, you had to manually set the starting page number to your document via the Numbering & Section Options contextual menu in the Pages panel. Now, you can set it right at the start of your document creation.
Not a huge feature, but a nice one for those who regularly create auto page numbers that don’t start with the number 1.