Each sample only contains the absolute minimum necessary to illustrate a very specific GWT feature. For example, the GWT Sortable Table application gives you this in a web page, i.e., there's only a table with headers that can be clicked to sort the columns, but there is nothing else (no text, no bells, no whistles, only the table itself):
In this case, the sample source structure is as follows, with the only files you really need to work with highlighted:
All seven samples are of a very similar size and structure, so the above should give you an idea of what to expect. When you go to the GWT Starter Kit page, you will see a list of screenshots at the bottom of the page, each illustrating the specific feature that each of the samples provides. My intention is to provide a sequel to Introduction to the Google Web Toolkit Framework, covering at least two or three of the samples provided by the GWT Starter Kit.