woothemes/woocommerce — pull request #291 by curtismchale (2011-11-29 19:09:56+00:00)
Title: Fixes the display in the screen options of tags and categories so they don't get confused with the tags and categories built in to WordPress core.

...product categories' to remove confusion on the menu screen options when you're trying to create a link to a product tag or category. Previously they showed up as simply 'category' and 'tag' which created confusion since the internal WordPress taxonomies have the same name.

Goes with support ticket:
https://github.com/woothemes/woocommerce/issues/290