For web developers, it is often wise to test how your you design looks using an alternate resolution to yours. For example, if you have your screen set to 1200 x 1024, and want to see how it looks to a potential viewer using a 1024 x 768 resolution, resizing your screen or browser window is quite a hassle. Instead enter this shortcut into your address bar:

javascript:resizeTo(1024,768)

Of course you can change the numbers to anything you want to test. Additionally, you can bookmark this code so it will be available at the click of a button. This is a pretty handy way to test web pages as you go.