Imagine this picture...you turn on your PC, use Google Desktop to find a document, open it in Word 2003 and then print it to your Windows-only printer. A normal Windows users day right? Did I mention this person's OS is free software, is developed by a community and is in active development now?
That's right, there is a Windows replacement in the works (and now partially working!) that plans binary compatibility with Windows XP. That means you can use the same applications, the same drivers and have an easy UI. Talk about having your cake and eating it too!