The word from our friends over at Neowin.net is that Windows XP Service Pack 3 has been given a set of release dates. Previously given a release of "2008-ish" we now have a very specific set of dates to track. The shocker is how soon they are. You'll be able to snag a release copy of Service Pack 3 as soon as April 29th.
For the full set of dates, including when it will be automatically pushed via Windows Update, and a lively discussion on what's to come from this latest (and likely last) major update to WindowsXP, hit up the thread over at Neowin.