This is the Cake Conventions from the old wiki site.

1. tables names are plural and lowercased
2. model names singular and CamelCased: ModelName
3. model filenames are singular and underscored: model_name.php
4. controller names are plural and CamelCased with *Controller* appended: ControllerNamesController
5. controller filenames are plural and underscored with *controller* appended: controller_names_controller.php
6. associations should use the ModelName, and the order should match the order of the foreignKeys: var $belongsTo = ‘User’;
7. foreign keys should always be: table_name_in_singular_form_id: user_id (foreign key) -> users (table)
8. many-to-many join tables should be named: alphabetically_first_table_plural_alphabetically_second_table_plural ie: tags_users
9. columns in many-to-many join tables should be named like other foreign keys ie: tag_id and user_id
10. columns named created and modified will automatically be populated correctly
11. components should be CamelCased: MyComponent : my_component.php : var $components = array(‘MyComponent’); $this->MyComponent->method();
12. helpers should be CamelCased: MyHelper: my_helper.php: var $helpers = array(‘MyHelper’); $myHelper->method();

Source: http://bakery.cakephp.org/articles/sajt/2007/02/25/cake-conventions