I made the switch a few weeks ago. Initially, I fell in love with the titanium powerbook's good looks - sleek, sliver, sexy... I'm big on visuals. When I saw a friend's up close I thought... "wow!" After using the Mac OS X system for just a day or two I was sold. I absolutely love the simplicity of installing programs: drag and drop. Uninstalling? drag and drop into the trash. No more .DLLs, no more incompatibilities, no more uninstalling and reinstalling from "control panel/add/remove programs...
Oh, and being the big digitial photo taker that I am, I was blown away by the included bundle of iLife '04. I'm a video editing junkie now... I've called up friends and family members and offered to burn their home movies to DVD just to be able to play around with iDVD and iMovie more extensively. I never needed a driver or software installation when I hooked up my camera, my bluetooth mouse, my iSight, none of my peripherals... just plug it in, and it works. So sweet! iPod? Works like a dream. I can't imagine ever going back to Windoze again.
Now I see what all the fuss is about.