Do you want to keep your site multi-language friendly? Please follow this:

1. Use t('text') instead of 'text'
2. Enable Multilingual in your content types
3. If your site uses English, do it with pure English first, then translate
4. Avoid the use of HTML into strings as much as possible
5. In CCK fields, use PHP code for Allowed values list, i.e.: return array(1=>t('text'), ...)
6 - 10. Read the manual http://drupal.org/handbooks

Blessings.