There isn't a simple way to copy the new products layout. You would need to be familiar with the code to try it.

There are a couple of ways to modify the product listing layout.
This definition added to the end of your stylesheet.css will give some space around each element of your product listing, and put a line under each item in the list:

.productListing-data {
padding: 0.5em;
border-bottom: 1px solid #33CC99;
}

Change the numbers as you wish; eliminate the border-bottom if you don't want the line. You can just have padding-bottom if you want.

For more complete control of spacing, dweingart submitted a nice simple mod which can be seen here. It allows product listing columns to be addressed separately and positioned/styled.