writes "Some handy Japanese guy called Hamachiya discovered a bug in Internet Explorer. Under certain conditions, an asterisk when used as a wildcard can crash IE as soon as the user attempts to go to another page."
The article claims the "five HTML tags and a CSS declaration" crash IE7 as well as IE6, but I couldn't get IE7 to fail. This page
says that as of June, IE6 was at about 37% market share and IE7 under 20%.