How to take full snap shot of a scrolling web page?

How to take snap shot of a complete web page?
What is the best Screen capture software available?

Using Print Screen, we can only take a snap shot of the currently visible portion of the website. But there are many tools which allows to scroll till bottom of the page and take a complete snap shot.

I found one very useful tool called snagit which allows me to take snap shot of a web page till bottom of it by scrolling through the web page.

There is a 30 days free trial version to download. Download it and enjoy. http://www.techsmith.com/screen-capture.asp

Snippy is also another nice tool. It’s very small and doesn't require to install it. Just run the exe and use it.
Download at http://www.bhelpuri.net/Snippy/default.htm