I’ll side with Ed on this. To deliberately degrade an IE user’s browsing experience is just the kind of thing FF supporters should be against.
And bear in mind that a significant number of web users aren’t in control of what browser’s on their desktop. They might be home users on a machine set up by a geek who don’t know how to change browsers… they might be corporate users who are using IE because of corporate policy… they might be in a Net cafe.
To my mind it’s just as ratty as, say, MS deciding to release some software for XP only, when there’s no technical reason it can’t run on Windows 2000. Screw the user, it’s all about market share at any cost.
As a contrast, here’s the WordPress mob’s campaign: BrowseHappy.