The home button in the navigation is a dying breed, though some people are really stuck on it.

IMO, the navigation is sacred real estate that should remain uncluttered. A gratuitous Home link adds 0 value there.

The cases when you *may* consider putting Home link in nav are if you're targeting an older (read: elderly) audience, the general population, or an otherwise web illiterate group.

The last case is if you're linking from a site's blog/sub domain and want to direct the user back to the main site. Even then, I think the verbiage "Return to main site" is a better UX than Home.

Let me know if you have any other UX questions.