no but make sure you jailbreak it to your specific ipods generation and the type of software e.g. ios 4.2
no it wont but it might make your ipod slow
Sometimes depends if the apps that you install have bugs
It is up to you. No matter what you have on your ipod will become messed up when Jailbreaking...
As of today (November 24th, 2010), jailbreaking an iPod Touch is not illegal. Is it 100% safe? No.
Jailbreaking an iPod could either be a success or a failure (meaning your iPod could break). It's your decision, but a risky one.
I think that many people are finding the most jailbreaking software for their ipod.
Yes, jailbreaking does void the warranty.
you cant
no
Yes
It is illegal.
jailbreaking the ipod touch is legal. But if you use the tool that gives you all apps free it is illegal.