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But if you believe Jakob Nielson (sp?) then the number of users who realise the logo is a link is slowly increasing but is not at the point where you can totally rely on them understanding this so you should supplement it with a normal link.
3 home links seems a bit much, but it depends a lot on that link at the bottom of the page. Does the user always see it without scrolling? Is it obvious at first sight?
If one of tose 2 questions is no, keep the navigation link.