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For the record, I was not seeing them a few days /or weeks back.
walkman > out doorman: how old is your site? Would you say it is linked by well known sites/authoritative ones? I am trying to see why some have them live, some generated only and somenot even generated by Google.
I have two niche sites: #1 was launched in aug 2006, #2 was launched in may 2007.
#1 has inbound links from 3 fairly authoritative sites (within this niche) and 2 authoritative (unrelated) sites. Also it has inbound links from a couple of libraries plus indbounds from several less important sites and a couple of unrelated directories.
Also it is ranked #1 for the main keyword in Google, Yahoo and MSN SERPs.
#2 has an inbound link from my #1 site plus an inbound link from an unrelated authoritative site/directory. Also it has inbounds from Wikipedia (probably not any direct link value because of the use of rel="nofollow") and some less important sites and a couple of unrelated directories.
Both sites are non-english and non-commercial websites in a small, but still growing niche area on the web -- and traffic is counted in hundreds, not thousands or millions, unique visitors per month.
Maybe small sites and small niches are not worthy of sitelinks?
[edited by: OutdoorMan at 10:20 pm (utc) on Jan. 5, 2008]