Google started to show some special sitelinks for Wikipedia articles... The sitelinks for Wikipedia results are special because Google doesn't send you to a different page, but to a section of the article. This is especially useful for long articles that include a lot of information.
This particular source bills itself as "unofficial news and tips about Google", so take that into account. But it looks like this new feature is only for long Wikipedia article pages right now. If anyone spots page fragement sitelinks for any place other than Wikipedia, that would be interesting news.