Question : Problem: where are iTunes playlist and other files stored on Vista?

I have iTunes 8 installed on my new Vista machine.  I also now have a seperate network storage device connected.
What I'd like to do is figure out how I can re-configure iTunes, and move any subsequent files, to my network storage drive (N:)
I'd like to know which files iTunes uses to store information that could occasionally change.  For example, the playlists or the iTunes music locations, my iPod Nano information.  I assume there are seperate files for all of these items? I have seen two instances of library files on my c:\users\... folder so I don't understand why there are two...
I have already moved my iTunes music folder to the network drive (N:\iTunes)

Here is what I need for maximum point reward:
1) tell me the names of all of the files (xml?) that iTunes keeps info in and where they would currently be located on a Vista computer.
2) also tell me what info each file contains (playlist info, music location info, etc)
3) give me good instructions on what to move/copy to my network drive so that when I use iTunes, my Nano info, playlist, library are all on the network drive.

I have a backup of my library files from my XP machine but I don't know how to use these files since the location of the music has now changed.  When I tried to use the music library file for my new setup, the playlist was there but they all had ?'s by their name (location is now different). Can I easily correct this?
As a point of reference regarding technical skills, I am highly computer technical, but inexperienced in iTunes related matters.

Answer : Problem: where are iTunes playlist and other files stored on Vista?

The only two files that iTunes uses for the kind of things you're talking about are itunes library.itl and itunes music library.xml.  They should be located in a folder called "itunes" usually within "My Documents\My Music" in XP.  In Vista, they are in \Users\[your username]\Music\

itunes library.itl function:  This file is a database of the songs in your library and the playlists you've created. Some song-specific data is saved in this file. If you delete the file, iTunes creates a new, empty copy when you open the application, but any playlists, song ratings, comments, or other information you created is lost. The iTunes Library file is only used by iTunes.

itunes music library.xml function:  
This file contains some (but not all) of the same information stored in the iTunes Library file. The purpose of the iTunes Music Library.xml file is to make your music and playlists available to other applications on your computer. In Mac OS X other iLife applications (like iPhoto, iDVD, and iMovie) use this file to make it easier for you to add music from your iTunes library to your projects.

Basically all you should need to do is to move these two files to your network storage, then follow these instructions:  http://support.apple.com/kb/HT1451