The Maximize jelly in OS X that makes a screen the full size that the screen should be is great. The command that it runs is called Zoom. There’s another one to minimize screens, as well. The minimize has a keystroke mapped of Command-Shift-M. I use it all the time. You can also map a keystroke to make the windows bigger, invoking that Zoom command. Sometimes, when I plug and unplug the monitor on my desk at work at take my laptop home, I end up with windows stuck where the jellies (what those little buttons in the top corner of the screen are called) are above the menu bar…
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QuickLook
If you click on a file, folder or image in Mac OS X and then press the space bar to see a QuickLook screen. Here, you can click on the diagonal arrows pointing outwards to move into full screen – great for showing documents or images during presentations. While in full screen mode, click on the diagonal arrows again to go back to a windowed appearance. If it is an image then you can will also have an icon to save the image into iPhoto and can option-click on the image to zoom in.