Google has lots of flavors of Sitelinks but did you know that the Sitelinks change dynamically not just based on query but also based on your time filter?
For example, search for [microsoft] in Google and you will get typical Sitelinks from Microsoft site. For example, you get Dev Center, Support, Office, and so on:
But if you go to the search tools on the left and restrict the search to let's say this past week, you get a different set of Sitelinks:
The content from these sections are more fresh, like the news center, some new announcements and I guess popular but recently updated pages.
It doesn't seem to be perfect but it might be a useful tool for SEOs to see what "fresh" or "recent" pages Google deems to be important on your web site.
Forum discussion at WebmasterWorld.