There are a range of misuse of W3C standards in IE6.
With the impending release of IE7 and 8 a lot of these should
be fixed.
Leading WASP, Molly E. Holzschlag has had discussions with IE7
engineers, here are her comments.
"Expect significant repairs to most existing
bugs, implementation of long-awaited CSS features such as fixed positioning,
child selectors, and attribute selectors.
Alpha transparency in PNGs? Yes!
The XML declaration will now be available without disturbing the DOCTYPE
switch, and object handling will be improved with proper fallback.
However, some things simply won't be there.
Generated content? .Won't make it.
There's an overflow problem that probably won't be
fixed, and object for images will most likely not be repaired in IE7."
Slowly Microsoft are getting closer to the standards.