More about Sitelinks can be found at Google’s help entry. Also, see Google’s
site operator, which lets you search on just a single domain in the normal search box.
Update: Ionut Alex. Chitu says “The new feature seems to be available only for the US”.
Update 2: Others in the comments are reporting they’re seeing this from outside the US too, so it’s not a US only thing. [Thanks Pd and Heliton!]
Update 4: Even that data center above may not work for everyone at all times.
Update: Now I saw such a sitesearch box pop up in the top result for the query associated press. However, the ap.org result had no sitelinks, so it seems the sitesearch is not directly connected to sitelinks (though it perhaps coincides with sitelinks more often).
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