well, no. not if you use "manually manage songs" instead of the "Automatic sync" function on your ipod.
i do not recommend doing this, to be honest. if you do choose to do it one time to get music, use Sharepod to take that music you took from your friend and put it onto your PC. then go back to automatic sync mode.
alternatively - why not just put the music on a flash drive until you get home? then just drag and drop to your itunes library.
They are both of our computers, one is the laptop, the other, our PC, and the laptop is where all my music is, and it's on the fritz. Rar.