If you're eager to try out SP1 for Windows Vista but do not want to wait until the official launch in March, then there is an alternative, as it seems like both the 32 and 64-bit versions have made their way online and are widely available from various torrent sites.

You can download the service pack on its own, or you could download one of the versions of Windows Vista with SP1 integrated if you don't care about doing the right thing, and pay your hard earned money to Microsoft for a copy of the OS.

The version numners are as follows: Windows Vista Service Pack 1 - Build 6001.18000(RTM.080118-1840) 32-bit English and Windows Vista Service Pack 1 - Build 6001.18000(RTM.080118-1840) 64-bit English.