CERT has suggested that users stop using IE because of a serious conjuction of two security flaws: one in IE, another in IIS.
If there weren’t enough reasons to hate IE, try searching Google to find some more. Me, I just hate it because of all the bugs in their CSS implementation.
Some people want you to use buttons to advertise your distaste. I like their advice:
I’m using Mozilla on my FreeBSD and Linux boxes, and Firefox on my XP laptop. I couldn’t be happier.