Recently I have had heard folks talking about an SP that I had not heard about, the reason is that its not yet released, in fact it may be up to two years off.
http://pcworld.com/article/id,122871-page,1/article.html?RSS=RSSThough Microsoft still won't confirm that it will release a third service pack for its Windows XP operating system, a preview version of the software update has been made available on the Web.
An "unofficial" preview pack of Windows XP Service Pack 3 is available at The Hotfix, a software download site and discussion forum that focuses on patches and software updates.
Ethan Allen, creator and administrator of The Hotfix, said Wednesday that he assembled the preview pack from software updates sent by an internal Microsoft source that are expected to be released in SP3.
The updates include Windows log-on improvements and features that fix current problems with connecting Windows XP computers to various networks, according to the SP3 forum on the site.
Hope that helps keep the rumours under control