This is also 3 columns layout with content presented at center, but the right side column was designed to present content of secondary importance comparing to those in left side column. On side columns you can present modules with equal importance. The width of side columns can be adjusted conveniently via template parameters.
JSN Dome layout system is very flexible and capable. Module positions are designed in smart way to cover all possible spot where you might want to put content. More over, you can specify width of both overall layout and specific columns conveniently via template parameters. Bellow is live presentation of some most popular layout variations: