[lwhi]

If the majority of people used IE, would that be a good reason to forget about supporting other browsers?

I'd say it wouldn't; I reckon content produced for the web should always allow people the freedom to choose how they view it.

Not supporting IE6 is something I could maybe understand - but forgetting about IE7 and IE8, because of time constraints, is a maybe bit lazy.

It's not that difficult to use principles of progressive enhancement and a CSS resets script to iron out inconsistencies.