First off they are two totally different mobiles. The iPhone is great for multimedia, even though it has a 2MP camera with out autofocus it does take good pics. The music part is great, and movies are brilliant on the screen. The amount of apps is amazing especially Shazam! But the push email still doesn't work well so that leads into what makes a Blackberry a Crackberry.
The Bold I assume is nice my personal experince comes from the Curve but as a email device there is non other. The cammera is ok I guess and the music app is a joke. I do like the actual keyboard over the touchscreen of the iPhone even though the iPhone is pretty acurate in typing.
I have both a Curve and both the 2G and 3G iPhones. Out of all three I prefer the 2G. The 3G is less stable, feels cheaper and locks up often. The 3G has GPS but I don't really care until TomTom annouces an iPhone version and then the3G is all I'll use.
So....there is my two cents...maybe five cents on the topic. I hope it helped a bit.

I think this too. For german readers, here's a good article: click here

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i phone is best

iPhone is the only way to go

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I phone 3g

iphone is good for me

I would go for Blackberry Bold, if you are into recording stuff with your camera and also for business... if you like playing around on your phone and messing around then definitely iPhone.

blackberry :)

i preferred iphone3g

I'm a musician, so iPhone all the way. With all the apps being developed, it's SO flexible. And when the new 3.0 soft comes along, it'll be closer to an actual phone, lol.