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[eluser]Michael Wales[/eluser]
The user is guide is located at http://www.ellislab.com/codeigniter/user-guide/?

Here are a few quick tips off the top of my head:
1. If you use CI's Native Sessions (I love them, personally) - use the library available via the SVN.
2. You can get the SVN URL from the Download area in the User Guide.
3. Don't get stuck on only using CI code. There are tons of great third-party libraries and modifications that will make your life easier.
4. Validation is a great area for third-party libraries. Search these forums for SetFields() and validators - should save you a lot of time.
5. Always, always, always validate your input (beyond the validator class). Never trust your form submissions and never use a hidden field for anything you intend to verify.
6. <pre>&lt;?= print_r($this->data); ?&gt;</pre> is a life-saver
7. Never use Scaffolding
8. Use RegEx for URI Routing - the selectors CI provides will just make your life miserable