New Listing Template for 1st SERP result

Links to additional pages shown below result - Let's analyze

[KlausWright]

On searches such as "hotels" "books" or "hotel reviews" the first result has 4 links to additional pages on the given site. How are they chosen? What do these new variables mean? - [google.com...]

"smap" would imply "sitemap" to me, however I did not use the Sitemap Submission feature, and my sites are coming up in this fashion as well. (and no, amazon.com and hotels.com are not mine :)

I wonder what those kids are up to over there.