Validate installed fonts in Font Book
12/20/2011
In Font Book, to validate installed fonts to determine whether they are safe to use, select a font in the Font column, and then choose File> Validate Font.
Restore the standard system font configuration in Font Book
09/26/2011
In Font Book, to restore your Mac's standard system font configuration by removing any non-standard fonts, choose File> Restore Standard Fonts.
Export fonts from Font Book
04/04/2011
In Font Book, to export fonts into their own "Exported Fonts" folder, select some fonts to export, then do File> Export Fonts.
Use custom text for typeface previews in Font Book
11/05/2010
To customize the sample text seen in previews of typefaces and characters in Font Book, do Preview> Custom, then type the text to be previewed.
Get detailed font info in Font Book
08/28/2010
In Font Book, to get detailed info about a selected font, including its hard drive location, font kind, usage license, etc., do Preview> Show Font Info.
Print a catalog of all fonts installed on your Mac
04/27/2010
To print a catalog of all fonts installed on your Mac, open Font Book, then do Edit > Select All and then do File > Print.
