Yeah, so XP SP3 is five years old. So what? Does it still work? Yes. Does it still run all my Windows applications? Yes. So, tell me again, exactly why I should upgrade?
Oh sure, Windows 7 SP1 has some good points. It's a bit faster, it's a bit more secure, it has some nice network features such as Libraries and DirectAccess, and it has Internet Explorer (IE) 9, which is better than IE 8. Of course, Chrome 21 is better than any version of IE and it runs just fine on Windows 7 and XP.
The bottom line is that while I prefer desktop Linux, especially Mint, on my Windows PCs I'm still using XP on many of them. Why? Because it just works.
One of the reasons why I'm so hostile to Windows 8 is that it breaks all the old ways of doing things in Windows and offers no real improvements over Windows 7 or XP. True, Windows 8 will have antivirus Defender/Security Essentials built-in, but any business IT person worth his or her salt already has those running. The simple truth is there's no reason what-so-ever to "upgrade" an older computer to Windows 8.
Be that as it may, XP has recently been getting a bad rap for security. Contrary to some reports, properly maintained and updated XP is as secure as any version of Windows. Besides, if safety is your number one concern for your desktop operating system, you should be running Linux, not Windows.
Heck, if the Windows 8 launch turns out to be as big a disaster as I think it will be, who knows? Maybe XP will yet see its end of support life extended for a few more years. I, for one, would be happy to keep running XP for another few years. In short, don't kill my Windows XP!