Pre-beta testers may already have Windows Vista SP1 and XP SP3
If the rumors are true, and they may not be (despite a series of screenshots making the rounds), the Windows XP service pack weighs in at about 350MB and offers up about 900 solutions to reported problems. Many of those fixes have been addressed via various Microsoft hotfixes since Service Pack 2 was released. But it's nice to have everything in one place.
As for Windows vista Service Pack 1, it appears that it's only available as a DVD ISO, not as a standalone updater. Again, take this all with a grain of salt. For all we know someone doctored a few screenshots just to get us excited about the possibility of a less buggy version of Windows Vista. One thing we can tell you. Those reliability packs released prematurely into the wild last week are not Service Pack 1.
[via All About Microsoft]