OK, my two cents here...
Why should anyone jump the gun with this one ? I mean, if we could wait untill now, we can wait a little bit longer to see final, but I really mean FINAL release on the Microsoft WEB site. If it's final, then they would release it on official Windows Update site. Don't get me wrong guys, of course SP2 is A MUST, but final version, not some "unfinished" stuff... even when it becomes official and final release, I'm sure we'll see many more updates to come... this guy will find this issue, that guy will find something else that doesn't work as it should work and so on, and so on...
My SP1 works just great, I really don't feel any need to update it untill it's final release. Anyway, we really don't know who is meesing with those SP2 update files out there... maybe it's silly, but someone with very good hacking attributes could "fix" something inside, and open some security holes... that way, in the future, he/she or anybody else who wants to do something like that, would be able to workaround security measures even in SP2... think about it... maybe it sounds silly, but for sure it's possible.
Always look for digital signature. One of company's policy that I work for is: "Never install any drivers for windows without digital signature, no matter how good and improved they are. Just wait for Microsoft to sign it... we don't need even more problems just because drivers are not signed..."
People, be patient... I'm sure they will release final SP2 very soon... even after that, good and wise thing to do is to wait little (little) bit longer, just to see how everything works on other systems.
Cheers !