Suggest a tool to Jailbreak Ipod?

Jailbreak Ipod firmware build 3.13
I don’t want to brick it so could someone suggest a tool that has 90-100% success rate please? Thanks.
Answer #1
SPIRIT
http://www.google.com?t=5438506&highlight=
Answer #2
It’s impossible to brick an iDevice.
That said, what generation iPod Touch are you using? It may be worth it to upgrade to iOS 4.
Answer #3
Use spirit if you’re staying with current firmware, or upgrade to 4.1 and use greenpois0n or limera1n