You can keep using it until it doesn't get you where you want to go.
Here I already moved away from Windows NT 4.0, 2000 and now XP. As I am writing apps the move to 7 has been great. I'd do that again!
I found a very interesting article about the upcoming release of Internet Explorer 9
courtesy of the extremeTech.com
If you're thinking about running the Internet Explorer 9 Platform Preview, here's one word of advice: Don't bother installing it on Windows XP. If you do, you'll get to a dialog stating "Windows Internet Explorer Platform Preview does not support any operating system earlier than Windows Vista SP2."
Obviously, don't even think about versions for non-Windows operating systems, either. IE General Manager Dean Hachamovitch told me that Mac and Linux versions weren't currently in the company's plans.
The reason IE9 doesn't work in XP is that it uses the Direct2D feature of DirectX when accessing the graphics hardware to accelerate image creation and drawing. Direct2D was introduced in Windows 7, and then added to Windows Vista SP2 and Windows Server 2008 R2?but not to Windows XP.
When I asked members of the IE9 team about plans for the legacy OS, they confirmed for me that XP was not in the cards:
Windows XP users have a fast, safe, reliable and private browser in Internet Explorer 8. As the Web has continued to change in everything from security to the future HTML5 applications developers are starting to build today, browsers should require the modern graphics and security infrastructure that has come along since 2001. Internet Explorer 9 requires the modern graphics and security underpinnings that have come since 2001, and is intended to be run on a modern operating system in order to build on the latest hardware and operating system innovations.
It only makes sense that the OS vendor wants to give people as many reasons as possible to upgrade their PCs to Windows 7, and not spend time or resources on updating software that debuted almost nine years ago. Still, this probably won't make XP loyalists smile, especially if they want to take advantage of IE9's impressive new features and performance.
What We want to know is When Internet Explorer 9 Comes Out As a general release, is it time to finally upgrade to windows 7 we're curious to know what everyone else thinks