You can download Windows XP SP2 Final (Build 2180) now!
Simply use
Google and search for xpsp2_RTM_ENU.exe if you cannot wait for the official download expected in a few days or weeks.
Build 2180 is 266.1MB in size for the English version.
below is a summary of the key milestones of the distribution plan:
8/6 Release to manufacturing
8/9 Release to Microsoft Download Center (network installation package)
8/9 Release to MSDN subscription site (CD ISO image)
8/10 Release to Automatic Updates (for machines running pre-release versions of Windows XP Service Pack 2 only)
8/16 Release to Automatic Updates (for machines NOT running pre-releases versions of Windows XP Service Pack 2)
8/16 Release to Software Update Services
Later in August Release to Windows Update for interactive user installations