It's yet another browser that I'm going to need to support for CommYou, of course, so it's a slightly mixed blessing -- standards compliance is lovely, but not a panacea when I still have to support those other pieces of crap Internet Explorer. But the speed improvement should be a real boon for heavy Web users.
(Caveat for the non-techies: keep in mind that this is just improvements in rendering and running speed. If you've got a slow connection, it can't help you. But some pages will likely show up a lot faster.)
Since the browser is so crucial to my work, I'm waiting until release before I actually install it on my main computer. But I'm waiting eagerly...