The IE7 dev team are actually going to change CSS handling to be more consistant with the standards, and have detailed a few on their blog.

Address CSS consistency problems. Our first and most important goal with our Cascading Style Sheet support is to remove the major inconsistencies so that web developers have a consistent set of functionality on which they can rely. For example, we have already checked in the fixes to the peekaboo and guillotine bugs documented at positioniseverything.net so use of floated elements become more consistent.

’bout time too. major inconsistencies sounds so much nicer than stupid bug doesn’t it. The PNG support is a great thing too, hopefully PNGs can get the popularity they deserve.