Looks like webmaster tools will let you know if you qualify as a established site.

Sitelinks [?]

forum.vbulletinsetup.com


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.
Because we generate sitelinks dynamically, this list can change from time to time.

Google has not generated any sitelinks for your site. Sitelinks are completely automated, and we show them only if we think they'll be useful to the user. If your site's structure doesn't allow our algorithms to find good sitelinks, or we don't think that the sitelinks are relevant to the user's query, we won't show them. However, we are always working to improve how we find and display sitelinks.

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what are the minimum requirements to qualify as a established site and get site links?

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Webmaster Forum | Webmaster Blog | Web Directory

I don't know really
and I've yet to see a result like the site links example

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i feel getting inbound links from high quality sites can help getting sitelinks.

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This is what google has to say..

DUH....should have read Brandon's post completely..LOL!

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Truck Drivers and the Industry