In case you missed Patrick's blog post last week (http://omeka.org/blog/2011/07/21/new-and-improved-documentation/), we have been busy at work on editing and re-organizing the documentation.
That means we are ready for contributions to the documentation.
We have created some helpful guides to formatting function documentation http://omeka.org/codex/How_to_write_a_function_documentation_page and for writing up a "recipe" solution to a common problem related to theming, plugin modifications, or developing something new: http://omeka.org/codex/How_to_write_a_recipe_page.
If you have created a particular effect or solved a small issue, you can help the Omeka community by sharing what you came up with. If you have learned from a thread in the Omeka forums, writing a recipe that distills your new knowledge is a great way to solidify it while you help others. We have a few examples already: http://omeka.org/codex/Documentation#Recipes
We invite anyone to register on the Omeka wiki and contribute.
Please post here if you have questions or any comments about the new formatting or organizational structure of the codex.