Google Sitelinks

Out checking my Google Sitemap report [Webmaster tools]. I noticed under the Links tab .. Sitelinks, that Google has included sub pages that will show up in a Google search for my site. The pic is an example they use to show people what they are talking about. I did a few Google searches but I don't see the additional links showing up. Looks like they picked the major site pages, which happen to be located at the bottom of each page of the site.
Components - http://www.interfacebus.com/Components.html
Buses - http://www.interfacebus.com/Interface_Bus_Types.html
Reference - http://www.interfacebus.com/Reference_and_Information.html
Equipment - http://www.interfacebus.com/OEM_Equipment.html
Design - http://www.interfacebus.com/Logic_Design_Descriptions.html
Standards - http://www.interfacebus.com/Standards_and_Publications.html
Software - http://www.interfacebus.com/Software.html
Distributors - http://www.interfacebus.com/Parts_Distributors.html