Microsoft has released the Vista SP2 Release Candidate version for testers. Since this is the RC version, it's not the final version that will go out to the public, but it's very close. I've gone through the hassle of installing various RC service packs, but then you have to uninstall them before you install the final version. It can be quite time-consuming, but it may be worth your while if you're suffering from some of the common Vista plagues that are being patched by SP2. I think I'll wait for the final release.