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The main features of this template are its large horizontal ad banner at the top and the 3 side columns. The side columns can be made into just 2 columns by not filling up the page elements for the top sidebar. So, it's kinda more like a flexible column template than just a 3 or 4 column template. All the sidebars can be customized separately: you can make the borders visible or blend with the backgrounds, and have the sidebars in different color sets.
The header is made thin to put more focus on the banner. You can use the default plain header, or use your own header with an image size of 1000 x 60 pixels.