
Sep 16, '09 07:30:00AM • Contributed by: HairyPotter

Command-Shift-. (period)
If you have your Mac adjusted for a region where the comma is the decimal separator of fraction numbers, or if you are using a keyboard with a comma instead a point on the numerical keyboard, then the shortcut is
Command-Shift-, (comma)
This has to be the comma on the numerical keyboard.
[robg adds: This does not work in 10.5, and is one of the more-useful undisclosed features I've yet heard of in Snow Leopard.]