[Samsung Galaxy Nexus] case0:
Hey,

There was a thread like this a while ago (here) but it kind of died and the OP was never updated so I'm restarting it here :)

Here are tips, tricks, undocumented/lesser known features etc. Please add more and I'll try and keep this post updated. I'll probably try to categorise in the future as well and add more pictures.

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General ICS

You can uninstall an app straight from the app drawer -

Simply drag it from the app drawer to the bin at the top of the home screen.

Removing the Google Search bar from home screens -

Just go into Settings > Apps > Google Search > Disable

When using an app which has been updated to use the new action bar, you can hold down on an icon for a brief description of what it does

Take a screenshot - Hold the volume down and power key (simultaneously)

On the volume bar, you can press the icon on the left to switch between ring and vibrate.

You can use the front facing camera to record 720p HD video

If you double tap whilst recording a video you can take a still image

Clock app

Whilst in the Clock app - tapping the screen will dim everything with your wallpaper in the background. Long-pressing the screen will black everything out and turn the clock blue

Clock app

When you receive an incoming call from a land line, it displays the location based on the area code

Hardware acceleration in apps -

Enable in Settings > Developer options > Forge GPU rendering

This can make some apps run a lot smoother, however it can also make others force close so you have to experiment a bit.

Owner Info -

In Settings -> Security -> Owner Info

You can enter info to display on the lockscreen, such as a name or a phone number to call if it is lost

Face unlock -

If you're on 4.0.2, you can take multiple pictures to improve recognition, for example in different lighting, with or without glasses on, etc.

When using slide to unlock, you can access notifications without unlocking by pulling down the notification bar as you usually would

Camera time lapse mode -

The Galaxy Nexus has a nice little feature which lets you create time lapse videos like this video. It's under video on the stock camera app.

Time lapse

Multi-touch bug -

There is a bug which sometimes stops the device registering input from both sides (seen in this video). A temporary solution until Google fixes it, is to turn the screen off and on again (solution from this thread)

Easter Egg -

Under About on settings, tap repeatedly on the version number for a little ICS picture. Tap and hold the picture for an animation.

Browser

Browser quick controls -

Enable in Browser Settings > Labs > Quick Controls

Removes the top bar and lets you access controls by sliding your thumb in from the side of the screen, great feature!

Quick controls

Long press the back button in the browser to get to History/Bookmarks

Inverted rendering in browser -

Enable in Browser settings > Accessibility > Inverted Rendering

Saves battery and makes night-time reading easier

Inverted rendering

Stock keyboard

On the prediction bar, tap on a word and slide your finger up to see more choices (you can also long press)

If you need just one symbol, press and hold the ?123 key, then slide your finger to the symbol you want, then release -- you'll automatically be returned to letter-entry mode.

If you long-press the stock keyboard space bar, it will allow you to select a different keyboard.

Other apps

Low speaker volume

There is a paid app on the market called Volume+ which is apprently quite good, allows you to increase the speaker volume beyond the normal limit (costs 99p)

Can't add Facebook account

This is a problem due to a dispute between Google & Facebook. There is a paid app called Haxsync which works quite well for syncing your Facebook pictures/status updates to your contacts (costs 89p)

Customise LED notifications

There is an app on the Market called Lightflow which lets you change lots of LED settings such as pulse time, colour etc. (Free or paid for £1.49)

Stop it going to call log after a call ends

Paid app called AfterCall (92p) will let you change what happens, for example go back to your previous app. Also two free alternatives: On Call End and Not Call Log.

Speaker Proximity

Automatically switches to speakerphone when you pull the phone away from your face, and vice-versa.