You can't download music without paying for it, so I am sure people just copy music to it. It really sucks for browsing the internet so I can see that most people do not even use it.
The bandwidth is probably all from email and myspace.
For me, I use it at work when I want to access something like IGN or Gamestop that gets blocked by the firewall. I have had my iPhone for about 5 weeks and have received 440MB and sent 22.4 MB as of right now.
As for browsing, I find it leap and bounds above the Blackberry and Sony Ericsson phones we also have. -- "A religious war is like children fighting over who has the strongest imaginary friend."
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