Site Links in snippets

How does the algorithm work

[ante99]

As the SiteLinks looks real good to me, I am very interested in how these works. For those that donīt know what they are, search for Webmasterworld and check the four indented links.

A list below of what I think will not influence the SiteLinks:
* Metatags
* Titles
* Analytics (have seen sites without Analytics show up)

Things that might influence SiteLinks single or combined
* Listings in directories (dmoz.org etc)
* Google Toolbar - clickpaths
* Links from indexpage

More ideas?
I really want to get this myself, but having a
site built in frames might be a problem...

[tedster]

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:

Google SERPS - subcategories with site links in the description [webmasterworld.com]
Extended description at #1 -- now PLUS a #2 result [webmasterworld.com]
Does Google Sitemap help to get "extended listings" [webmasterworld.com]
Extended site description - what makes the extra section happen? [webmasterworld.com]