Several new scams are making their way around the internet (most recently a PayPal scam) that direct users to "spoofed" websites. These websites take advantage of a known flaw in Internet Explorer to display a fake URL in the address & status bar.
One of the suggestions from Microsoft to verify "suspicious" websites is to type in a Javascript string to verify that the page is hosted that URL displayed in the address bar. Given the length of the code needed to verify the address, this is a well-intended suggestion, but it's just not practical.
Kevin Donahue has created a quick and easy bookmarklet to help prevent spoofed URLs in Internet Explorer using the Microsoft suggested code. If you're an IE user this bookmarklet is a great way to verify the page you're viewing isn't spoofed, especially if you arrived there from an email message.
Visit Kevin's website for the Spoof Check Bookmarklet.