Using this Webshot program, you can capture full height screenshot of a website. I think this is a must have program since most screenshot captures software did not support this feature. Moreover, this is free and won’t cost you any money unlike expensive commercial software outside there. Another interesting feature that I have found when using this software is you can adjust the image quality of the screenshot easily using the slider provided.
WebShot is a program that allows you to take screenshots and thumbnails of webpages or whole websites. It comes with a command line interface for advanced users. The following image formats are supported JPG, GIF, PNG, BMP.
p/s: If you find that this software is useful, I hope that you will donate few bucks to the developer. I think he did a great job.