You cannot put themes on an iPod Touch without the jailbreak.
It depends on what software your ipod is running.
Not without erasing the jailbreak.
How to jailbreak my iPod touch
you need 4.0.1 to jailbreak it
no, to get a newer jailbreak you have to restore the ipod touch and then update the ipod touch and then download the jailbreak. that is a huge con for jailbreaking.
You can turn off the iPod Touch if you jailbreak it.
No currently there is no jailbreak available for the ipod touch 2nd gen
There is no 3gb on the ipod touch.
to jailbreak your ipod 4.1 go to greenpois0n.com
to jailbreak your iPod 4.1 go to greenpois0n.com
Yes, you can "Undo" a Jailbreak, by going into iTunes and Restoring your iPod Touch, or iPhone.