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Download them from the App store on iTunes, or jailbreak your touch and use the methods developed by that community.

I have yet to decide on the fate of mine, so I'm not sure of the specifics of installing after jailbreak. I'm also unsure if the App store works with a Jailbroken iPod...
 
mine is jailbroke and works just fine with itunes I can't find out how do dowload fom my computer though
 
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