Why should you start thinking about Linux now?

The next version of Ubuntu is being released next month (April '07).  That version will have the Ubuntu Migration Assistant which will convert your existing Windows settings, like your email address, your documents, your Internet favorites, and more to your new Linux system.

It's never been easier to make the switch.  Linux is already compatible with more hardware than Vista.   See some of the screenshots of it in action at http://shots.osdir.com/slideshows/slideshow.php?release=751&slide=4. 

Download a LiveCD and try it out.  It's easy, it's free, it works.  Just think about it. :)