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Sitelinks are additional links Google sometimes generates from site contents in order to help users navigate your site. Google generates these sitelinks periodically from your site's contents.
Saw this new feature this morning, I like it, itlooks like they are going to start showing a basic index of important pages under your serp results, but not in effect yet.
[edited by: tedster at 11:38 pm (utc) on Oct. 18, 2007]
[edit reason] moved from another location [/edit]
Google publishes information on SiteLinks (extended listings) [webmasterworld.com] Sep. 8, 2006
Now we show what percentage each query result or click represents out of the top 20 queries. This should help you see how well the result or click volume is distributed in the top 20.
Still not crystal clear to me, but my best understanding is that your top 20 click-producing terms are totalled, and the percentage of that total for each search term is what Google reports.
This seems to add up. Search volume will vary for different terms. So a low position on a "big search term" can still produce more clicks than a high position for a rare search.
On the other hand, I looked at the history stuff - a lot (if not most) of the sites in my GWT account only have history numbers going back 30 days max. And I only looked at the sites that generally have a lot of traffic. So maybe they don't have it all in yet, or may it's six months worth starting *now* (which means in five months it will all be there) or...?