Almost complete list of Android ICS features:
Virtual buttons in the user experience free up display space
Create folders by dragging apps on top of each other
A new tab for thumbing through your widgets
Calendar app now supports pinch-to-zoom
Gmail gets offline search (nice), a two-line preview, and gesture support for swiping between conversations
The revamped Gmail user interface has an action bar for composing a message, searching, and accessing labels
Take screenshots by holding power and volume down buttons (finally!)
"Request desktop site" in the Chrome browser opens the full version of a Web site and syncs with your bookmarks
Save Web pages offline and use up to 16 tabs in the browser
More keyboard error correction and an inline spell check
Access apps directly from the lock screen
A recent applications icon
"Roboto" is a new typeface
Delete individual notifications by dragging them off the notifications menu
Improved voice integration and copy and paste
Face Unlock is a facial recognition service that use your face to unlock the phone
New Data Usage options in the Settings menu will notify users when they near a data use limit and disable the feature when the limit is reached
You can kill off apps that are using data in the background
Open the camera quickly from the home screen
Camera has no shutter lag, continuous focus, zoom while recording, panorama photos, time lapse settings, and 1080p recording
Face detection in the camera
Integrated photo editor including focus and exposure and "hipster filters" (we don't want to know)
New gallery layout, organized by location and person
People app brings together high-res photos, social media information, and status updates
Phone app lets you swipe between favorite friends with integrated visual voice mail
New photo gallery layout for organizing by location and person
Speed up and slow down voice mails
Quick message sends canned response text message when you decline a call
Android Beam, an NFC feature for exchanging information between two phones by tapping them