Thought I would put my 2pence in on this thread, even tho it is one of a many.
BlackBerry's are obvioulsy aimed at the business market.
That said
they provide some good instant messaging integration.There are a couple more that aren't listed there as well.
Over the air software updates are available with 4.5 firmware and above, and weigh in at XXMB, and you don't have to worry about restoring your data, as it doesn't get deleted. Plus the fact it doesn't have to be connected to a computer to update..
Tethering, I was doing that 2 years ago with BlackBerry's, not I just have datacards
Customising a BlackBerry, assuming you aren't a BES user with a security focused IT dept, allows for a good day of playing to get it setup like you want.
Themes, many of them, plus you can create your own.
BBM, everyone slates it, and gives it 'send an SMS or IM', BBM is IM, and it comes out your data bundle, so doesn't really cost anything
Media, I play music on my iPhone, my BlackBerry can do this equally as well. I don't watch Videos on
any mobile phone as I find the screen to small. I'll watch videos on my 46" T.V. thanks...
Storage, BlackBerry allows for removable memory cards, that can be encrypted
Third party applications, without the approval process. I had turn by turn maps on the first BlackBerry with integrated GPS, for instance
More than 1 (one) current device...
Push email and PIM without the battery drain
Background apps and notifications is nothing new...
BUT, in mind of all the above, I have both BlackBerry and iPhone.
BlackBerry, then iPhone. Use both at the same time, on corporate and personal networks and enjoy both, but enjoy iPhone more.
I do prefer the iPhone, it is quciker than my Storm (probably not my Bold) and I just like the look and feel of device and UI
Just my opinion