I am testing right now the South Beach Diet. The meal structure is pretty simple: the standard three meals a day is recommended with snacks in between. This is an important note to remember for those still in their first two weeks on the South Beach Diet. Beyond that, there is almost no structure to follow.
The South Beach Diet does not cover measuring or weighing of foods. Neither does it require you to count carbs. As long as you keep to the rule of avoiding high GI carbs, then you should be okay.
There are lists of foods to include and to exclude and lists to avoid and to enjoy. But a lot is typically left to the individual in choosing what you want to eat within those lists.