"site listing" in SERP??

Why is it that certain websites have a collection of links underneath their URL when searched for? For instance, search for "microsoft" and Microsoft.com will be the first result, with 5 sub links for other major parts of the site. How can I get my site to show up with sub links for "about us", "forums", etc? I have an XML sitemap, but I guess that has nothing to do with it. This is one of those search engine things I never understood.

 

You need to have a trusted website and inner pages

 

I would like to know the answer to this question too

 

Google trusted site, in details Google decide if your site can be considered as a trusted site, in this case it show the additional links also called sitelinks.
http://www.google.com/support/webmasters/bin/answer.py?answer=47334&topic=8523

 

I thought that piece of info was related with the second link that appears in the SERPs on some results for some sites.

 

does anyone know what qualifies a site as "trusted" in Google's eyes?

 

The sites that have those little authority links are chosen by the Goggle algorithm