I want to buy an iPod touch but am getting a new computer soon. Will my new computer wipe out my iPod touch?

I currently have a Mac and I want to buy an iPod touch that will sync with this Mac. I am getting a new PC a few months from now. Will my iPod touch be wiped out when I sync a new computer to this same iPod touch? Or will it sync to both computers (podcasts, music, videos, photos)? Do you have experience with this?