There’s been a lot of fuzz going on about the necessity of the Acid3 test. It was about time that someone wrote about this all with some soberness.
Here are some articles which I guess are worth reading about the tests that push browsers to the limit:
Oh, and just in case, someone forgot: This is why you should use semantic markup.
All articles have been listed in the ever so useful newsletter „Web Design References“ by Laura Carson which can be subscribed to at: http://www.d.umn.edu/goto/webdevlist