This resource from Kim's Korner for Teacher Talk defines various patterns of text organization and provides a brief essay example of each pattern.

In writing and reading organization is the key to a reader's understanding. A great site for those of you who are looking for some further explanation of organization in writing. There is instruction, an example text, and specific...

Here is a run-down of several basic patterns of organization to use when writing. An example is given for each pattern, as well as an explanation.