QuickDial on the iPhone
Yes, it's true. I have become an iPhone fanboy. I love this thing, and feel totally disconnected when I don't have it with me (which isn't very often).
There was originally one single feature that I felt Windows Mobile did better than the iPhone: Dialing contacts based on just typing their names. For some reason, on the iPhone, you need to look up contacts, or have them in your Favorites list, to dial them (other than memorized numbers, of course). Finally, the gap has been closed: QuickDial for the iPhone is out, and it's a gloriously simple (and effective) piece of $0.99 software. You can find information here: http://iphone.pinpointsolutionsinc.com/, but just take your iPhone, head to the App Store, and search for QuickDial.
I've replaced the Phone icon with the QuickDial icon on the bottom of the home screen. That's how much I like it.