I recently had a great chat with a client about site links in the Google Search Engine Results Pages. Turns out Google has a nice little post explaining what they are, and how they are obtained. In addtion they announce the launch of one-line site links. I think this new feature will bring an increase in traffic for those sites that obtain these one line sitelinks. To read more visit the blog post on one line site links.
Here is an example of how they look: