I did something, fat fingered some key combination, and now the buttons and text on my Properties panel is really huge. I have no idea what I did to cause this. Using ctrl-scrollwheel like in 2.49 doesn’t work. So how do you scale the size of things in a panel? This is in 2.58, BTW.
With your mouse in the properties panel press the Home key on your keyboard to reset their size
Also just found another fix (by accident) holding ctrl and moving the mouse within the panel window resizes stuff too.