Android ICS vs iOS 5

Features	Android ICS	iOS 5
Google Services	The instant account-based access you get to Gmail, Google Maps, the contacts, the calendar, Latitude, and chat are great.	You can download Google apps from the App Store, too. The Google Voice app has a better layout for iOS but it's also slower and much less stable.
Camera Tools	Ice Cream Sandwich brings on a whole lot of new photo tools, the most significant of which are the photo-editing tools in the image gallery. They include red-eye reduction, straightening, and "hipster filters," whatever those are. The camera app itself adds a useful panorama mode that seamlessly creates a landscape still.	iOS 5 has great software image rendering, but photo quality also requires the image sensor and camera lens In the camera roll, you can create a slideshow, plus crop, rotate, remove red-eye, and auto-enhance, but from the looks of it Ice Cream Sandwich have more features.
NFC	NFC (near-field communications) is becoming a big deal in mobile. If you have an NFC-compatible phone, you'll be able to use the on-board Google Wallet software right away to pay for purchases by tapping or waving your phone near a compatible terminal .	No NFC for iOS 5 yet
Cloud feature	Android has long enjoyed over-the-air OS updates, and its online Android Market also takes advantage of over-the-air app installation. Google Music is one big cloud feature	iCloud does over-the-air syncing from the device to the cloud (no more USB connection to the computer!) and syncs content like apps, music, and contacts, so you can later restore. You can also wirelessly edit photos, manage e-mail folders, and create and delete calendars.
Voice Action App	Android has also had its own voice actions app, which can launch navigation, calls, texts, search, and more, at your command	‘Siri’ is the voice-triggered assistant with an attitude that replaces the Voice Control app. ‘Siri' can create reminders, search for directions, text people, call you a cab, and so on
Turn-by-turn voice navigation	Google's turn-by-turn voice navigation for driving directions can effectively replace your in-car dash or GPS navigator--and possibly save you hundreds of dollars	Integrated Google maps are great, but there's no voice readout

iPhone

iPhone:

The 1st iphone was introduced in January of 2007.Then in July 2008, the iphone 3G was released in 23 countries, next the iphone3Gs was released in June of 2009. The iphone 4 is the most recent model of the iphone to date. The iPhone 4 connects on GSM network and was exclusively available for AT&T prior to Apple’s announcement on January 2011 of a new variant, the iP0hne 4 CDMA, which is made available on Verizon Wireless.

Comparison Chart

	IPhone 4		iPhone 3GS	IPhone 3G	IPhone (Original)
Variant	iPhone 4 GSM	IPhone 4 CDMA
Release Date	Jun-10	Jul-11	Jun-09	Jun-09	Jun-07
Operating System	iOS 4.0	iOS 4.2.6	iOS 3.0	iOS 2.0	iOS 1.0
Display	3.5-inch capacitive touch screen(640) x (960) pixels		3.5-inch capacitive touch screen(320) x (480) pixels	3.5-inch capacitive touch screen(320) x (480) pixels	3.5-inch capacitive touch screen(320) x (480) pixels
Processor	1GHz ARM Cortex-A8Apple A4 chipset		600 MHz ARM Cortex-A8	412 MHz processor	412 MHz processor
Memory	512 RAM16 or 32 GB storage		256 MB RAM8, 16, or 32 GB storage	128 MB RAM8 or 16 GB storage	128 MB RAM8 or 16 GB storage
Data Connectivity	GPRSEDGE	N/A	WiFi b/g3G	WiFi b/g3G	WiFi b/gBluetooth
			Bluetooth	Bluetooth	USB 2.0
	WiFi 802.11 b/g/n3G		USB 2.0	USB 2.0
	Bluetooth
	USB 2.0
Cameras	5 MegapixelLED Flash		3.15 Megapixelno secondary camera	2.0 Megapixelno secondary camera	2.0 Megapixelno secondary camera
	Secondary camera present

Free online course: iPhone Application Development

http://www.stanford.edu/class/cs193p/cgi-bin/drupal/

It's basically an entire iPhone dev class, from Standford, posted onto the web.