Again, MacNify is spilling out the coolest trick to get things done - in this case, blowing your screen.
The trickHold the "shift" and "ctrl" key, and do a scroll-up using your mouse's scroll button. Or equivalently, use your two fingers to scroll up on your MacBook's trackpad. You simply get a zoom-in effect of everything on screen, REALTIME! Still holding the keys and do a scroll-down, and you can gradually zoom out again. Ain't that cool?
Look at how much I have zoomed-in on the Apple logo! But things get a little blurry if you overdo it.