Little Snapper is one of the little hidden gems that came along w/ the last Heist bundle. Basically, it's a screen grab tool w/ some nice features (web grabs-anyone).
You might be asking yourself, why do I need a screen grab tool when it is built right into the Mac OS, which is true.... but LS makes it really easy to organize your screen shots (which you can't do easily w/ the OS feature) and best of all by typing in a URL (inside of LS) it will take a screen grab of that website.
What separates LS from other screen grabbing tools is that not only can you take a shot, you can then edit it in the LS interface. Think of it as a combo of the Mac OS tool and Skitch built all into one. It really is a nice/useful tool and worth a look.
Click here for more info.