I think there are more and more reasons to move from an iPhone to an Android-powered device.
1. Android is open, and so is its marketplace. Enough said. If the App store has 100,000 apps, how many do you really expect you'll need or use for more than 3-days? At 11k apps and growing, I hope the Android Marketplace does not get too big and become bloated like the App store. The app store reminds me of one of
Apple's TV ads but the roles are reversed.
2. There are new devices appearing and each offer different features that make them more tailorable to your liking. Whether you are a mad-texter, or a web browser, or want to check twitter and get a few emails, there is a Android-powered phone just right for you. It is not one-size fits all, er one phone.
HTC GI
HTC MyTouch
Samsung Behold II
Motorola Motoblur
HTC Droid Eris
Motorola Droid
HTC Hero
I have tested all these phones and they each have their unique strengths.
3. Multitasking. There are many apps, not
an app for that. Why not run more than one app at a time. Run an FTP app that transfers a file to where you need it, while you are reading email or browsing the web...
4. 3G Coverage if you choose Verizon Wireless or live in the middle of the country.