iphone vs blackbery pearl (both with AT&T service)
Internet: iphone. you can view everything and don't have wrapping problems or size issues - which you do with the blackberry. When you are on a wifi connection, the speed is incredible. I use the internet much more on the iphone - especially for driving directions and things that used to be a pain with the blackberry
Music: iphone. I had a 2gig card on the blackberry and it played well, but syncing is better/easier/faster on the iphone. The downside to the iphone is that it doesn't support A2DP (streaming stereo music via bluetooth) which the Curve blackberry does. I will get around this issue with an adapter, but it's pretty lame for apple not to include the software.
Syncing: iphone. I sync contacts and calendars on 2 pcs. Contrary to what the apple folks tell you and what you might read, you can do so easily and it is actually more accurate than the blackberry was. (You cannot sync music to 2 computers) However, it took me hours to get the sync cleaned up when I first tried - mostly due to oddities from previous blackberry syncs. The downside is you can't sync notes which do sync on the blackberry.
Phone: blackberry. My reception is intermittent on the iphone - I've compared it to our other phones and know it's the iphone and not just the service or weather. I'll go from a strong signal to no signal without moving while the signal on other AT&T phones remains strong. I'm still working on trying to figure out what is causing this because if it keeps up, I won't keep the phone. I also miss the voice dialing feature on the blackberry. And, if I'm downloading something via edge, the phone doesn't work (incoming calls go straight to voicemail)
email: blackberry. emails are not saved in the inbox on the iphone, so everytime you want to read one, it has to load from the server (which can't be done while you are on the phone). The work around for saving emails is to send them to the trash file or forward them as ironically, sent and deleted emails are saved on the phone! But, you have to make sure you have the entire message and attachment open when you delete or forward the email if you want to make sure they are saved on the phone for future viewing. It's a bit of a pain to say the least.
email attachments: iphone. I haven't gotten an attachment that I couldn't read. No, you can't edit them, but I couldn't on the blackberry either and I couldn't read half or more of the attachments.
cost: The upfront cost of the iphone is more than the blackberry, but the monthly costs are lower - especially if you go overseas.
cool factor: iphone. it's a much more fun phone to play with, which is going to make it really difficult for me to go back to a blackberry if I'm unable to get better email and phone performance from the iphone! The downside is its size - it's really too big to wear on a belt clip -whereas the blackberry pearl is nice and small.
Good luck deciding!