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You can always do it that hard way, using FUGU. It's a pretty complicated program as it "roots" the phone, and you just add the themes that you want. I would definitely read up on a couple tutorials before messing with it though.
 
DiskAid is the best program for moving files to and from your iPhone/Computer.
 
Thanks for that info. I'm gonna actually try this out tonight myself! :D

Actually, I've found PhoneView to be the best app for transferring stuff between your Mac & iPhone. I've tried Fugu, CyberDuck, Flow, iPhone Explorer, and PhoneDisk, but I always come back to PhoneView.
 
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