No, updating an iPod will not delete anything on your iPod.
Go to settings and scroll down. Click on the Mail, Contacts and Calendars button. Click on your email address and then scroll down. Press the "Delete Account" button. Done!
Your iPod will not delete apps on its own. You must delete the apps yourself.
No, iPod software will not delete your music.
Yes you can delete your email. :)
Delete them from your iTunes library, then re-sync your iPod.
when you restore an ipod it doesn't delete your songs or apps but it will delete your high scores from the last time you sync your ipod.
no
Downgrading your iPod Touch should not delete anything.
you press the delete botton
You can delete them from the computer on iTunes.
You cannot delete the legal information in the settings on your iPod Touch.