Oh - you might be okay to jb it using the latest redsn0w though, if it's an iPod Touch 2G you have. And that's easy to use, too. See the section below the top one on that site (headed "All four one").
And you can use redsn0w to switch on multitasking and the wallpaper thing (though the latter will be slow on your iPod).
Edited by padmavyuha (06/24/1012:54 PM)
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For now, the redsn0w beta release supports only the iPhone3G and iPod Touch 2G at today’s 4.0. It’s still a beta, so you’ll need to let Cydia reorganize, reload, and update after using redsn0w.
Isn't that what you have?
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