I'd assume you'd be able to set up a home network with the two comps on them and transfer the files over if your pc's hd is formatted for fat32 format. Then just drag and drop your itunes folder over. I'm sort of in the same situation as you, just ordered me a new ibook and I need to get all my songs off my pc, but onto a external hd.
Try these two things one of the two might work for you, I just checked some sites. Credit goes to straform and xlas999999
I've done some moving from machine to machine. What I would do is:
1. Don't re-import them.
2. Drag over the entire iTunes folder from Windows to the Mac. The library files should be in that folder. Make sure that they come along to the new machine in the same location. They contain playlists etc.
3. Start iTunes and tell it where that folder is (in iTunes prefs, Advanced), if you didn't put it in the default location on the Mac. Double-check that iTunes is actually looking for the folder where it is located, and if not, point it there.
4. Finally, if iTunes still doesn't seem to "see" everything, drag the iTunes folder onto the iTunes icon. This seems to make iTunes re-read everything and re-link everything.
or if you have a iPod big enough....
Now that you tell me that you have an iPod it can be easily done.
1) Transfer EVERYTHING onto your iPod. Do an Automatic update in iTunes (prefs>ipod> check auto sync)
2) Plug your iPod into your Mac (don't have iTunes initialize it or whatever)
3) Download iPodRip
4) Fire iPodRip up and click Recover Songs or something to that effect
That will copy all the metadata and there is also an option to do playlists as well.
hope that helps out some.
~Z