The passcode to unlock an iPod (or iPad or iPhone) isn't stored anywhere, only you can remember it. If you can't remember it then you will need to connect the iPod to the computer that you normally sync to and you should then be able to reset the iPod and restore/re-sync your content to it (http://support.apple.com/kb/HT1212) - you may need to put the iPod into recovery mode in order to be able to reset it : http://support.apple.com/kb/ht1808
If you do it via a different computer then :
If you restore on a different computer that was never synced with the device, you will be able to unlock the device for use and remove the passcode, but your data will not be present.
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