Msg#: 3064307 posted 2:07 pm on Aug 29, 2006 (gmt 0)
One of the big things about Site Links in the description snippets is that they re keyword specific. A domain with a #1 for both keywordA and keywordB can show Site Links in one and not the other. The closer the keyword is to the business name and/or domain name also seems to be a factor -- my assumption is that this factor means there is most likely one "expert site" for the keyword involved.
Note: For anyone not yet familiar with Site Links, here are some references: