I just bought a MacBook Pro and I love it by the way! How do I transfer my iTunes library from my old PC to my new MacBook?

iTunes: How to move your music to a new computer (Mac or Windows):

The Apple Store will do this for you.

You can call Apple Support and they will walk you through it.

You can type "move itunes library from pc to mac" into the google search bar.

iTunes: How to move [or copy] your music to a new computer [or another drive] - http://support.apple.com/kb/HT4527

do not confuse moving your whole folder and library with moving just media files as in

iTunes for Mac: Moving your iTunes Media folder - http://support.apple.com/kb/HT1449

Quick answer if you let iTunes manage your music: Copy the entire iTunes folder (and in doing so all its subfolders and files) intact to the other drive. Start iTunes with the option key held down and guide it to the new location of the library.

Macworld - How to transfer iTunes libraries between PC and Mac - http://www.macworld.com/article/46248/2005/08/shiftitunes.html

I suggest you migrate all your data from your PC to your Mac.

See this -> http://support.apple.com/kb/DL1415 (Windows Migration Assistant download)

and this -> http://support.apple.com/kb/HT4796 (instructions)