Another great list over at Mashable lists different ways to get screen-shots of websites. Here are just few to wet your appetite. These are in the form of Firefox plugins, but they also list some standalone programs and some web based tools to get the job done.
Save as image – an aptly named Firefox plugin that lets you save a page, frame, or part of either as an image directly from Firefox.
Pearl Crescent Page Saver – Save images of web pages in jpg or png format; save the entire page or just a portion of it, with the ability to automatically scale the image to a smaller size.
Picnik for Firefox – if you use online image editor Picnik this Firefox plugin enables you to easily import a screenshot of the currently opened webpage into it.
Head over to the original article 15 Ways To Create Website Screenshots to get the full list.