Don't ignore the 'Title' tag of your webpage because it does make a difference. Your core keyword should be contained in the Title tag because it is one of the elements Google uses to determine what your site should be positioned for. However, don't make the mistake over-stuffing your Title tag with too many keywords. Putting more than two keywords in your Title is asking for trouble. A smart way to deal with this is to combine two keywords in such a way that they look one.