Useful Web-Apps?

Hey,

I'm looking into purchasing an iphone and I am looking for ways to convince my dad that the extra monthly bill is worth it. I currently have a hand-me-down verizon blackberry 8703e and my contract just ended in January. So, my question is, besides the obvious convergence properties of the iPhone, what Web-apps and features does the iPhone have that my Blackberry doesnt? Also, what native apps are expected when the SDK comes out that might further differentiate the iPhone from my Blackberry?

I thank you all in advance for your help.


Mike