You recognize the means you efficiently zoom - in in mobile safari? Just how do I do that on my Mac+magic trackpad in normal safari?
Wait for 10.7 "Lion" there'll you get the very same zooming as on the iPad and also you can also double - click columns to zoom the to complete window size.
Its a pinch activity similar to mobile safari. To trigger it, see to it Pinch Open and also Close is ticked in System Preferences