Yes, there even going to soon make a jailbreak for iOS 4.0
Yes, you can "Undo" a Jailbreak, by going into iTunes and Restoring your iPod Touch, or iPhone.
How to jailbreak my iPod touch
Try going on youtube and they will give you a full guide
to jailbreak your iPod 4.1 go to greenpois0n.com
Yeah of course. It isn't going to make a difference. When you jailbreak your IPod you are going to add an app called Cydia. Which take it from there will give you all the things you can dream of. :D
Try going on youtube and they will give you a full guide
No it wouldn't be broken. If there's something wrong with the Ipod, and it does brake, just restore it.
No. Your jailbreak will remain as it is. Syncing your iPod does not alter the jailbreak in any way.
to jailbreak your ipod 4.1 go to greenpois0n.com
No but you can jailbreak an iphone or ipod touch but they each have different sites to jailbreak your ipod/iphone
NO, it's actually better to have an older ipod to jailbreak it because it takes months for hackers to make a jailbreak for new ipod firmware.
no sadly you cannot jailbreak ipod nano's you can only jailbreak ipod touch, iphone, and ipad.