No, they shouldn't.
yes
no
No, iPod Touches cannot contract viruses.
Most likely no they can't
As some people have found to their cost not only is possible to jailbreak ( remove all safety features from Apple on the iPod) the iPod it is also possible to find out how many viruses do run on an iPod
You probably can somewhere, but you shouldn't NEED to. Unless you have jailbroken your Ipod Touch, viruses and malicous software will not run/work on the iPod Touch platform. Including e-mail attachments.
You have to go to jailbreakme.com from your ipod
Restoring an iPod should reinstate the warranty to a jailbroken iPod, unless a problem occurs during restoration, then the warranty isn't in effect since you are trying to restore a jailbroken iPod.
The Jailbroken IPod has Cydia, which "unlocks" or makes your IPod capable of more tasks than a regular IPod.
Yes, you can put music on a jailbroken iPod Touch.
Jailbreaking can only be done for iPod Touches and iPhones. No other phone has the ability to be jailbroken. For an iPhone, you need to download a software from the internet to jailbreak it.
Yes, but it will erase everything on the iPod, including things available only to jailbroken iDevices, such as Cydia, Winterboard, etc. You can then put all NON-jailbroken media back on the iPod by using a backup file of the iPod which is saved on iTunes.