That's more helpful!
Okay, to add a border to the left and right sides of the area where the posts are shown on the Delicious Magazine home page, try this:
border-right: 1px solid #005000;
border-left: 1px solid #005000;
padding: 0 10px;
Or, if you wanted to add shading to the sidebar to make it stand out a little like the sidebars do in your example image, try something like this:
Check out Firebug for Firefox. It's a web inspector tool that let's you right click on an element in a web page and shows you the corresponding HTML and CSS. It's very handy!