Making Text Bigger and Smaller

FROM : Shoaib Hannani
DATE : Fri Jul 14 21:59:23 2006

In Safari and Mail, there are shortcuts to make text bigger (Command 
+) and smaller (Command -) that work whether the SHIFT key is pressed 
down or not.

In the case of making text bigger (Command +) which requires you to 
press the SHIFT key, Safari and Mail don't require it so you're 
essentially pressing "Command =" but the shortcut in the menu says 
"Command +".

Does anyone know how I can achieve the same effect?

Thanks!