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not without Jailbreaking it from what I've read. there's probably a bunch of threads on this, I did some searching when I first got the phone. kinda annoying. I have a really cool chewbaca mms tone lol.
 
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Nice, I hope the future OS update would allow us to do these kinds of stuff.

highly doubtful.

Now that tethering is here with 3.0, the only reason I jailbreak is to customize the look/feel. I have replaced sms, keyboard, lock/unlock, and voicemail sounds as well as replaced my slider.
 
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