In my opinion,
sn0wbreeze is the best jailbreak.
jailbreaking the ipod touch is legal. But if you use the tool that gives you all apps free it is illegal.
Redsn0w is capable of jailbreaking firmware 3.1.2 for all iDevices
I think that many people are finding the most jailbreaking software for their ipod.
obviously, as you cannot get them w/o jailbreaking
Yes, jailbreaking does void the warranty.
"Jailbreaking" is another word hacking. Therefore you void your warranty but you get cydia, a jailbreaking software. Jailbreaking does have it advantages and Disadvantages. But if you want to send it to apple to repair it you have to restore it to factory settings to get back your warranty.
Yes; not jailbreaking it. If you mean a way to do the same thing as jailbreaking without actually doing so, there is no current way to do so.
There are various ways of doing this. If your jailbroken, You can use the SSH method. If you have iFile then you can do it that way as well. The other way is just using the jailbreak tool and jailbreaking your device.
Jailbreaking a phone is partially legal and partially illegal. I have a post regarding this http://www.techlucid.com/2013/11/is-jailbreaking-illegal-or-not/
Yes, a burette is the best tool for measuring acidYes, a burette is the best tool for measuring acid
It is impossible to get an installer on an iPod Touch without jailbreaking.
I think that spirit Is the best for the 3g iPod touch as others won't work with the new firmware, but I think that limera1n will be best when released