In an effort to vent in a healthy manner, I will vent here. Without further ado, the first (well, first posted here, many other reasons have come before this) reason as to why IE sucks ass:
IE doesn't support element.importNode(), part of the DOM Level 2 Core Specification.
I ran into this and now I have to make IE happy by using element.cloneNode(), which for some reason keeps bringing up an unsupported action error on that line.
Piece of crap.