Amazon and eBay are just two websites that have modified their URL structures over the last several years, parsing out categories and subdirectories from permalinks. The trend seems to be picking up, though it somewhat goes against traditional SEO siloing and taxonomy best practices.
This survey is designed to help build a current business rule for permalink structure through use of case study, experience, and expert opinion.
This survey will end on June 1st, 2011. Results will be posted for review and discussion at http://www.seosteve.com/ by June 5th, 2011.
Please share this survey with other experts in search engine optimization to help us draw a more conclusive answer. Thank you for your time and participation.