You get Cydia, a jailbreak software sometimes it comes pre-installed iphone. Sometimes your iPod wont turn on, and Will be a little slow a few times but it is worth it to get it jailbroken and get apps for free rather then paying 6.99 for one app.
... nothing
your screwed
Every time you turn your iPod off, you have to run blackra1n again
How to jailbreak my iPod touch
to jailbreak your iPod 4.1 go to greenpois0n.com
No. Your jailbreak will remain as it is. Syncing your iPod does not alter the jailbreak in any way.
just go to www.freewebs.com/gordonaton
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 sadly you cannot jailbreak ipod nano's you can only jailbreak ipod touch, iphone, and ipad.
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.
There is no requirement to jailbreak your ipod, in fact it will invalidate any warranty you have.