The Phishing Filter and the architectural work in IE7 around networking and ActiveX opt-in will help keep users more secure. IE7 also delivers a much easier browsing experience with features like tabbed browsing (especially with QuickTabs), shrink-to-fit printing, an easily customizable search box, and a new design that leaves more screen real estate for the web site you’re viewing.
If you are an IE user, then be sure to grab the latest version directly from Microsoft. This release includes many bug fixes as well as features… you will notice a big difference if you are still using 6.0.