Extjs , some best practices

During searching for best codding practices of extjs I found following links very good and informative.

• http://www.sencha.com/blog/top-10-ext-js-development-practices-to-avoid/
• http://www.sencha.com/blog/advanced-plugin-development-with-ext-js
• http://www.swarmonline.com/2011/05/20-things-to-avoid-or-do-when-getting-started-with-extjs-and-sencha-touch/
•  http://blog.credera.com/technology-insights/java/extjs-best-practices/