Brett_Tabke - 11:59 am on Sep 6, 2011 (gmt 0)
Ad Sitelinks can appear in four different formats: three-line, two-line, one-line, and embedded:
Three-line and two-line formats: Sitelinks are designed to trigger in situations where an ad provides the ideal answer for a search query. These ads are most likely to trigger on unique brand terms.
One-line format: Sitelinks will trigger with more generic terms, but may also include brand terms.
Embedded format: Sitelinks will trigger whenever your ad qualifies to appear above the search results and the text in your ad exactly matches one or more of your Sitelinks.