As per the
unofficial timeline, Windows XP Service Pack 3 (SP3) has finally hit the Release to Web (RTW) milestone. The 300MB+ x86 standalone installer is available on the Microsoft Download Center in English, German, Spanish, and so on.
XP SP3 (build 5512) is also available on
Windows Update as a 70MB download. There will be no x64 version of SP3 released; Windows XP x64 will be updated at the same time Windows Server 2003 is updated, since it is derived from the codebase of the latter. Although Microsoft has still to confirm the date, SP3 should be rolled out via Automatic Updates on June 10, 2008.
____________
Source: Ars Technia