My wife and I, too, just switched over from BlackBerrys. I had the Bold and she had the Pearl.
I have had a BlackBerry by my side since the 8700 came out and I have loved every second of it. Honestly, they keyboard is what slowed me down from switching sooner. There isn't a keyboard on any other phone that will beat what the BlackBerry offers. I could text faster without looking on a BlackBerry than I could type on a computer. I'm slowly getting faster and more accurate typing on an iPhone but it is taking me some time.
My thoughts and comparisons for what it's worth:
Screen: Advantage iPhone.
The screen of the iPhone is so much better in almost every aspect: color, clarity, rotation speed (compared to the Storm), response to touch, etc.
Form Factor: Advantage BlackBerry.
I prefer the thickness of the BlackBerry over the "thinness" of the iPhone. It's nothing that a case can't help out with though.
Typing: Advantage BlackBerry.
RIM has the best keyboards of any of the top phones available. They are small enough to be compact and big enough to easily type on them.
Web Browsing: Advantage iPhone.
This isn't even close. The iPhone blows away BlackBerry in web browsing. Safari is so much faster than what BlackBerry can offer including any 3rd party browsers. I used Bolt because it was such a pain to browse the web on the BB browser.
E-mail: Advantage BlackBerry.
BlackBerry is #1 when it comes to email. My Gmail was sent to my phone as soon as it hit my inbox. Even though email is not a priority for me, it was nice to have them instantly on my phone. With my iPhone I have to go to my email folder to have them pushed to my phone. But like I said, it's not a priority for me, but I know it is for many others.
Entertainment: Advantage iPhone.
Which would you prefer to use to listen to music: an iPod or a generic MP3 player made by SanDisk? That's about like comparing listening to music on an iPhone and a BlackBerry.
Apps: Advantage iPhone.
App Store is much, much better than App World. Navigating, download speeds and the overall user interface is so much better in the App Store. BlackBerry does have some good apps out and are slowly catching up to what the iPhone offers.
Battery Life: Advantage BlackBerry.
Not even close, BlackBerry OWNS in this comparison. I was a VERY heavy user of my Bold and would have 40% of my battery left at the end of the day. The battery of the iPhone doesn't come close to lasting as long. I have to plug my iPhone in at some point during the day for atleast an hour to make sure my battery doesn't die on me. I'm considering buying the Mophie Juice Pack case at Best Buy for $80 to help with the battery situation.
Just my opinin of the iPhone and BlackBerry.