Some good news today for those of you worried about the search engine rankings of your Joomla sites. According to an inteview with Vanessa Fox from Google, there will be no penalty for having duplicate content (that is: having many URLs pointing to the same page).
Joomla and other CMS systems often produce several duplicate URLs. According to Fox, you can use a Google SiteMap to tell the search engine which URL you do want listed. Otherwise the Google bots will do it for you and pick just one of your multiple URLs. Either way, there won’t be a penalty.
Watch the interview: