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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.
I consider myself a hardened Internet fiend but for some reason ALWAYS look for something that says home.
I was on a site earlier today that just had the logo and I spent ages cursing the design before remembering the old 'click the logo to go home'