OK So basically; this is what I followed; I'm adding a test two for those who may prefer an alternative:
est #1 - Default iTunes Music folder location
Starting with a "stock" iTunes on the PC, I copied the entire contents of the
"iTunes" folder from:
\Documents and Settings\username\My Documents\My Music\iTunes\
This included the two library files ("iTunes Library.itl" and "iTunes Music
Library.xml"), a folder named "Album Artwork", and the "iTunes Music" folder.
Then I said farewell to the PC....
On the Mac, I fired up iTunes once, just to make sure its prefs file and storage
folders got created. Next I quit iTunes, and deleted the "iTunes Library" file
from the /Users/username/Music/iTunes/ folder. (You can delete everything in
that folder if you wish, but at least delete the iTunes Library file.) Then I
copied over the four PC iTunes items -- two library files, two folders -- into
the Mac's "iTunes" folder. Then I fired up iTunes...and everything was just as
it should be. All the tunes were there, all the playcounts, all the ratings, all
the playlists, etc. (Feeling brave, I then quit iTunes, located the "iTunes
Library.itl" file I'd copied over from the PC, and removed the ".itl" extension
from the filename. Fired up iTunes again, and everything was still fine.)
And there you have it...
I posted twice for those may have problems in the future....