Sub-themes outside of the the theme folder is very important. It has really helped me when I update the base contrib themes since the sub-themes no longer have to be a subfolder within the base theme as in Drupal 5.

On Oct 24, 2009, at 12:34 PM, Laura wrote:

Something others have not said, but is extremely important: Do not
modify a theme you download. Make your theme a sub-theme of the base
theme you select, and then just override what you want. More info on
that is here: http://drupal.org/node/225125

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