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I have a widgets blog and everytime that I start another widgets related site I will link it to my home page with a post and then a link on the sidebar, and this way my readers will be able to see what I have created while keeping all of these sites tightly focussed
[edited by: Robert_Charlton at 6:24 pm (utc) on Aug. 6, 2007]
[edit reason] removed specifics [/edit]
I try to make the liinking rrelevent between the sites to enchance the user experience.
Also my sites have inbound links from other sites and each site has inbound links from different sites.
So I would think try to make it natural not a patern that Googlebot will pick up on.
Also do not just link from top page to top page.
Make the links relevent from wich Websites pages link to which Website pages.
Lastly, do not link from every page of your site to another site. I found that hurts the PR, unless you care more about user clicks vs a PR juice.