See, the whole thing is stupid. If you had a large enough storage unit, all you really have to do is copy all the contents of the folder My Music/itunes from your old machine to My Music/itunes to your new machine. It would copy all your songs, all your album covers, all your itunes settings, all your playcounts and ratings. Bang, all done. Just copy one fucking folder from a PC to the same place on another PC. But noooooooo, iTunes has to make it seem all complicated with useless "wizards."
whigsgeek, you have two options:
1) Copy the folders from your work laptop and put them in the exact same place on your laptop. For example, if all your stuff is in My Music/itunes/itunes music then just copy them to My Music/itune/itunes music on the laptop.
2) Copy the folders to whatever folder you want to create or already created in your laptop. Then you have to take one extra step, which is to fire up iTunes and go to edit>options. Then change the itunes music folder location to the folder you made. Do this BEFORE you scan the files if possible.
If you don't take the extra step, and you have "copy files to itunes music library when adding files" checked what it will do is copy all you folders into wherever itunes has designated as your itunes library folder. You'll end up with all your music files in two directories. So if you have 50 gigs worth of files, you'll end up with 100 gigs.
It's not THAT big a deal, because all you have to do is delete one of the directories. But deleting 50 gigs takes a little time, plus it just goes into your recycle bin and then you have to clean your recycle bin. It's just an annoyance and a bit of a time waste.
3) If you really care about your playcounts and ratings and all that, find the file called "itunes music library.xml" It is probably in My Tunes/itunes. Just copy it to My Tunes/itunes on your PC.