You want your web page to be read by your desired audience. That’s all. Your title tag is the first step toward achieving that goal. Abraham Lincoln once said, “If you have eight hours to chop down a tree, spend 6 hours sharpening your axe.” The title tag is your web pages axe, it’s the part you should refine so that you get the most from the search engines.
Title Tag guidelines: http://www.w3.org/Provider/Style/TITLE.html