Command-option-shift-i (Macintosh) or ctrl-alt-shift-i (Windows), or File > File Info displays a dialog box that lets you view and enter metadata about the file you’re currently editing. This works in InDesign, InCopy, Illustrator, Photoshop and Bridge.
Unfortunately, Flash, Fireworks, Soundbooth and Acrobat march to the beat of a different drummer:
In Flash, the menu command is still File > File Info, but there's no keyboard shortcut assigned.
In Fireworks, the menu command is File > File Info, but the keyboard shortcut is command-option-shift-f/ctrl-alt-shift-f.
In Soundbooth, metadata is entered in the Metadata panel (Window > Metadata).
In Acrobat, you access the metadata for the current document by choosing File > Properties, or pressing command-d (Macintosh) or ctrl-d (Windows).