Yes, Microsoft has released the SP1 for Vista 64 customers via it's windows update center. To start off, you'll have to install 2 critical updates, which ensure that the update/patch routines are brought in line with SP1 requirements. If you encrypt your Vista partition, you may need to install another update. Once that's done, re-boot and search for new updates. The one you want is 121.5 MB big and is called Service Pack 1. Download is a tad slow but everything seems to work just fine.