As glenngara and David point out, you don't want to go overboard. I think simply using Home" in your nav bar may be the best way to go, unless you really want someone to go back to the home page from within content pages. In most cases, the flow of traffic should be like a pyramid, in my opinion, with the traffic hopefully starting at the home page and drilling down to other pages that get more and more relevant to what they are seeking. This makes the anchor text links used within your content pages more important in support of other 2nd and 3rd level pages.
Perhaps if you have a rotating "special" or something that you offer only on the homepage and regularly update, this would be a reason to bring the visitor back to the homepage. In my opinion, again, I would feel that you would want to direct most people towards a conversion goal instead of back to the homepage. The "Home" navigation tab is one that most Internet users are used-to, and would therefore expect to see on the nav bar. As I always preach, if you place the user in mind first, the search engine will usually follow and rank accordingly. I doubt they would penalize you for using home too much, but if you layer on tons of keywords then you may get into a possibly “flag” territory.