http://www.google.com/search?hl=en&q=use+it&btnG=Hledat&lr= The first result - useit.com has under the description "more results from...". It appears when Google has more than two results from this page, right? But its not only this one condition I think. What other need the website have for showing this link? And the same question is about the categories of website above (alertbox, video at this link). How many categories can appear there at the most?
This has been seen for a while on google SERP's, sites which are considered to be good resources by google will show additional links next to the result. It can't be manipulated and you need to have a very large and well established site to see them.
But what is good resource? I know what ;-), but how can Google recognize it? I agree, Google recognize it very well, because I saw it only with realy good resources. But what can be the factors? PageRank? Doesnt Google try to calculate CTR of this sites? Something else? Can it be influenced (and how) by searched phrase? Because if I find the same page using another keywords there is no "more...".