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TODO: merge in these items to Theme_Review if they are specific to WordPress.org theme directory submissions and Theme_Development if they are for theme development in general. As open source code, WordPress developers like to keep things loose when it comes to what a user does with WordPress. However, when it comes to designing your styles or Themes for contests and public consumption, there are a few things you should take into consideration. These are not hard and fast rules, they are more guidelines, on how to make your Theme the best it can be before exposing it to the public. Having the ability to quickly change a site's look is very exciting, and having your Theme or style be one of their choices is even more exciting. To keep all of this excitement going, we need to make sure that under the hood, there are some consistencies and things you should know before releasing your hard work and wonderful design to the public.
Designing Themes for Public Release « WordPress Codex