Along with the new notification system, Android 4.0 includes a revamped multitasking interface. It's activated by tapping the new "recent apps" button, located next to the virtual back and home commands. This brings up a scrollable list of all the apps and services you've recently opened on your phone, showing each app's name, icon and a thumbnail of its most recent state. As with the new notifications area, you can tap any item to activate it or flick to dismiss it.
The improvement here over Android's old system -- long-pressing the home key to bring up a small and limited list of icons -- is immeasurable. The new multitasking interface is easy to find, fun to use, and a true highlight of the 4.0 platform.
The ICS keyboard and voice input
Google has really gone a long way in improving the system keyboard in Ice Cream Sandwich. Compared to past Android releases, the ICS keyboard is far better at predicting and correcting text, which means you can type quickly and/or sloppily and it'll almost always figure out what you're trying to say.
The new keyboard has a few nice bells and whistles, too, like built-in spell checking and a tremendously improved cut and paste system. I tend to be a fan of slide-based keyboards like Swype, but the stock Ice Cream Sandwich keyboard is good enough that I'm actually fine with -- and even enjoying -- using it.
On the voice-input front, the familiar microphone icon allows you to dictate text anywhere in the system, as it always has -- but now, text is transcribed continuously, so words show up as you're saying them instead of in one big chunk when you're finished speaking. You can also pause and stop speaking and the system will wait for you to continue instead of stopping the session. (To signal that you're finished, you press a "Done" button that appears on the screen.)
If the voice input mishears a word or two, error correction in Ice Cream Sandwich is quite easy: The system automatically underlines any words it thinks might be iffy, and then you just tap a word to see a list of likely alternatives and pick a replacement.
The many faces of the lock screen
You wouldn't think there'd be much to say about a phone's lock screen, but with Ice Cream Sandwich, this seemingly simple system component is jam-packed with tasty new treats.
If you don't set any security options, the default ICS lock screen uses a circular unlock gesture similar to what's seen in Honeycomb. The lock screen offers a lot more functionality now, catching up with options that some third-party utilities have previously offered.