favourite ipod touch/phone application

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What is your favourite ipod touch/iphone application? mine is definitely the tap tap revenge series where i can enjoy the music as well as play my hearts out. i got to noe new songs through TTR and i'm really glad for this application. Also, i think jailbreaking the itouch/iphone has brought many useful apps such as dtunes and maxtube. so what are some of your favourite apps or apps that u'll like to share?