Copy tunes to 2nd PC without syncing
If you have the same iTunes account you bought the music from on the other machine, you'll be OK. Just go to that machine and choose Store -&gt; Authorize this computer.... You can have up to 5 computers authorized to play your DRM'd music. Also, if you want to transfer music off an iPod, there are ways to do that without erasing it. Here's a link with info on apps for that.