Windows only: Portable freeware application SiteShoter takes screenshots of web sites with a powerful array of features.
Using the utility, which (like all of the excelllent NirSoft applications) requires no installation, is easy—just add the URL to the web site you want to capture, choose a filename to save the image to, and click Start to save the screenshot. What makes this utility great is the wide range of powerful options, including a full-featured command line—you can place special formatting codes in the filename to specify a timestamp or add the URL to the filename, which becomes very useful if you wanted to save screenshots for multiple sites at once.
You can choose how often you want the screenshots to be taken—the default is every 5 minutes, but you could take a screenshot every few hours instead. Rounding out the great feature list is the ability to save your configurations for later re-use—you could use the GUI to save the options and create a command-line shortcut to run that configuration on demand.
SiteShoter is a free download for Windows only. For more great utilities, check out how to customise your right-click menu with ShellExView, or just look through our top 10 tiny & awesome Windows utilities.