When you connect your i Pod to a new computer, you'll be prompted to erase its contents before proceeding.You can change the settings on your i Pod so that this doesn't happen in the future.
In order to restore your i Pod without losing data, you can first back up your i Pod in i Tunes, and then erase the i Pod's hard drive and restore the software.
You can also use a third-party program to transfer music without using i Tunes at all.
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However, moving the i Tunes library to another computer is not as difficult as it seems, since you have the original (host) computer up and running, so you can get stuff out of it.
Apple has detailed instructions for that, so have a look at them.