Microsoft has further delayed the release of Service Pack 3 for Windows XP, moving expected availability from the second half of 2007 to the first half of 2008.
Although that date is still listed as "preliminary" a similar delay for Windows Server 2003 SP2 seems to be finalized. Initially planned for the end of this year and currently in beta testing, SP2 will now arrive in the first quarter of 2007.
Read more about Microsoft service pack road map here