The home pages at NYTimes.com and WSJ.com have a few new elements today. At NYTimes.com, the site is finally opening its Times Extra feature in beta. The feature includes links to other news sites and blogs alongside the newspaper site’s own content. NYTimes.com readers can choose to view the “regular” unaggregated page by hitting the “Switch Back” button if they don’t want to mix outside content. The paper lined up Shell as the feature’s launch sponsor. What the NYT is doing with Times Extra is simply expanding the newspaper site’s existing aggregation feature which is handled by Blogrunner, out of its pen within the site’s Technology section. Nevertheless, it’s a big step for the NYT and represents the evolution of its approach to content.