I don’t think I can say this without sounding smug, so I’ll just say it: this is what I was talking about. If you went ahead and tried to hack your site so it worked in the previous beta, I’m sorry, but I tried to warn you.
It’s also why I said CSS hacks weren’t necessarily dead yet, or even likely to cause real problems, because there’s every chance that IE7 will be close to being another Firefox (in the standards-support and layout-behavior senses). We can’t be sure of that yet, of course, but the results described by Molly are pointing in that direction.
Sure, we’d like to see a hack-free Web, but that point will not come until a few years after IE7 finally ships. No, that’s wrong: we’ll never have a hack-free Web. But we might reach a time where cross-browser presentation has become not only commonplace, but subconsciously assumed, like our current expectation that a browser will know how to handle hyperlinks.