IE not as big as someone may seem
Some of the comments said IE has 80% of the browser market. NOT TRUE.
IE6 only has 24.5% and IE7 26% and at least It kan handle PNGs. :)
So have your facts right before you start sounding like an M$ employee.
Somehow standards have a remarkable way of working in every other industry why don't they work on the web. When doing development work it is so nice to have a standard to meet upon. I can always check my compatibility while developing and the client can always check my work by using the same validator.
Hopefully M$ will come to its senses and take care of this or the users using IE must come to there senses choosing a standard compliant web-browser.