PC Users

PC users can take a screenshot of anything displayed on their screen by pressing the "Print Screen" button on their keyboard, opening an image editing program (such as Photoshop or MS Paint) and then simultaneously pressing [Ctrl] [V] on their keyboard to paste the screenshot in the editing program. The screenshot can then be saved to the user's computer.

Coda
Coda is an amazing multipurpose program created by Panic Softare for the Mac OS platform; it combines a text and CSS editor, FTP program (based on the already wildly succesful FTP tool for Mac, Transmit), terminal, web previews of your files, and even has a built in version of The Web Programmers Desk Reference. I absolutely LOVE this program because it eliminates the need for having multiple applications open and streamlines my web editing and uploading process. Unfortunately for PC users, Coda is only available for Mac.