Sitelinks have been there for ages and I can't believe Google hasn't still created a solid algorithm of defining the worthy pages to show there. Nowadays much more sites are rewarded with sitelinks for brand-oriented searches and more and more of them are asolutely useless...
Here's only one example:
What criteria could have been used to reward an absolutely link-less and empty-in-content page a sitelink?
Does the word "Uncategorized" in the title send some sort of a positive signal to Google?