The Acid3 test has been uploaded and the next release of Safari is going to be awesome in terms of standards, currently passing with a 90/100.
http://acid3.acidtests.org
For those who don't know what this is about, the Acid test tests a browser's standards compliance. The current Safari (3.0.4) fails quite dismally with 39/100 but the nightly build for what will be Safari 3.1 is the highest passing. FireFox is around 60/100 and guess who is the biggest failure?
Safari 3.1 is going to be truly awesome in speed as well. If you're interested in trying it out download the Webkit version:
http://webkit.org/
WARNING: This is beta software and not recommended for blah blah blah
That being said here's an interesting write up about Safari 3.1 (WebKit nightly) and Acid3:
http://webkit.org/blog/158/the-acid-3-test/