Is this to do with sitemaps?

Hi there,
http://www.google.co.uk/search?sourceid=navclient&ie=UTF-8&rlz=1T4GGLJ_enGB209GB210&q=digitalpoint

You can see that it shows like this -



It has four categories under the link. My site looks like this -



Is this to do with sitemaps? Sorry if this is a stupid question

 

i think it's not related sitemap. google finds the related pages from your site. i looks like gift for some site. you can do nothink for that.

 

Ah alright, thanks a lot trichnosis Rep added!

 

info at http://www.google.com/support/webmasters/bin/answer.py?answer=47334

 

Thanks Amator that was just what I was looking for!

Rep added.

 

....If the structure of your site doesn't allow our algorithms to find good Sitelinks, or we don't think that the Sitelinks for your site are relevant for the user's query, we won't show them.....

I thought those links were shown only for authority websites.