There are few things more pathetic on a website than a Best Viewed With Internet Explorer icon. To me, it suggests that the designer was too lazy to make sure that their site followed the proper HTML specification. Especially when the site is a very simple one and doesn't use any advanced (or IE specific) features. Sites should be viewable with as many different browsers as possible. The WWW existed long before Microsoft woke up and decided to join in, and with the increase in people accessing web pages from mobile devices, it is become more important to make pages viewable in other browsers. These days, it's just plain rude to design a page with only Internet Explorer in mind.