An Extended Validation certificate in action in IE 7.
- Cross-domain barriers: IE7 helps to prevent scripts from interacting with content in other places, giving you additional protection against spyware.
- Visual security tips: I mentioned the phishing filter's ability to let you know when you're visited a phishing web site. In addition, when you visit a site that is particularly well protected (through the use of an extended validation [EV] certificate), the address bar turns green letting you know that the site is safe.
These are just some of the major security improvements found in IE7. If you have not, you should upgrade ASAP.