Now for switching OS's.. you will find its easier to switch from PC -> mac then the other way around.. first of all you dont have to worrie with any type of DOS prompts (b/c everyone knows that windows still runs on DOS in he background) and even though mac OSX runs on Unix in the background... you rarely have to use any unix commands (i think i have only once.. and that was just making some tweeks that i picked up from a magazine).
Yes Windows XP still runs on DOS. That's why.. um oh wait no it doesn't. Windows XP is based on NT, not DOS.
The trouble with the anti-Microsoft folk is they compare their current software to Microsoft pre-95. Is Mac OS X better then Windows 3.1 you bet ya, now try comparing it to Windows XP.
Oh dear... Their arguments fall to pieces.