It sounds pretty much like MS Vista's delay has some interesting consequences. Even though SP3 has not yet been released, it appears that Microsoft is already working on SP4. Rumours have it that it will be released in mid-2007. It is supposed to be a massive update for XP, and one wonders if this is going to be the last one Windows XP before Vista hits the market.

Well.. do a search on "windows SP4" for more rumours...