The Acid3 test is out. Ironic that this one comes towards the end of a Gecko development cycle (just like Acid2), meaning it will likely be a while (Mozilla2, the basis of what will likely be Firefox 4.0) until Acid3 compliance is met.
Seems like the WebKit guys are well on their way.
By the time Acid3 complaint browsers are the norm, web applications will have a very nice platform of features that they can depend on. These tests really do help coordinate browser vendors to focus on certain issues by providing a good test case that they can all compare (and compete) against.