When I say standards I mean things such as:
http://www.w3.org/Style/CSS/ - Box module, positioning, full support for every possible standards compliant implementation, etc
http://www.w3.org/Style/XSL/ - ugh
http://www.w3.org/Graphics/PNG/ - Alpha support requires use of a propertory filter, ugh
http://www.w3.org/Graphics/SVG/ - support non-existant
http://www.w3.org/P3P/ - ugh
Those are to name a few. It would be nice if Internet Explorer supported these standards and others strictly according to the specification so that webmasters would be able to innovate and create superior webpages rather than serve users of Microsoft Internet Explorer inferior webpages that are bloated with tables that position non-tabular data and display artifacted rasterized images. If Internet Explorer was to fully support these standards a Microsoft Internet Explorer user's user experience on websites that switch over to these standards (as all will eventually do) would greatly improve.
It would also be nice to see any propertory extensions of these standards be tagged so proper standards support is maintained. For example, Mozilla's extensions to the CSS specification have a -moz- prefix so that they do not break proper standards support.