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...We only show Sitelinks for results when we think they'll be useful to the user. 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.
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Google Information on SiteLinks [google.com]
Here are some of our previous discussions on the topic:
[edited by: tedster at 9:27 pm (utc) on Oct. 11, 2008]
You'll get this kind of listing if much traffic is generated with this keyword(s).
Because for fantasy words (most used for trademarks) get a lot of traffic via Google, you'll get special results for this at first.
See from my very local point of view:
I'm sure you'll find some by yourself at the .com just knowing that.