Unfortunately they thought better of publishing my letter, so I'm sharing it with you here.
Walter Gladwin suggests that web sites which only work in Internet Explorer are not broken and that rather than using an "inferior browser" we should all use IE and email Netscape telling them to improve their browser. This argument is flawed on many levels.
Firstly, Internet Explorer is only available on two platforms (various versions of Windows and the Mac). Many people who are using other operating systems or who access the web from devices other than PCs (PDAs, mobile phones, WebTV, etc) do not have the option of using IE. This is obviously a small proportion of the web-surfing public, but their numbers are growing.
Secondly, many non-IE browsers are not "inferior" to IE. While it's true that only IE has support for some Microsoft technologies like ActiveX, other browsers like Mozilla have far superior support for web standards like CSS and Unicode.
Thirdly, many of the sites that claim not to work in other browsers will, in fact, work very well. They simply check which browser you are using and display a "not supported" page if it isn't IE. If you tell your browser to pretend to be IE then you can often use the site without problems.
It is, of course, the webmasters choice which browsers are supported, but non-IE users is a group that will only get bigger. Why would you possibly want to ignore them?