I pulled some tidbits from around the interwebz that I have run across to help users get up to speed with Android 4.X. Most of this applies to ICS, but JB should be similar enough that it will roll over. First, for those who are completely green to Android, here are some links: What is Android Android Dictionary Android Terminology & Lingo Visual History of Android Ok, Android intro over, and now on to some more OS specific items (most of these are Ice Cream Sandwich but will apply to JellyBean as well): Nexus 7 Guidebook Galaxy Nexus Android 4.0 Guide (pdf download) Motorola Xoom Android 4.0 web guide Android ICS Walk-through on Transformer TF101 | ASUS CampusLife Can an Android 4.0 Tablet Replace Your Computer? | ASUS CampusLife Feature changes from previous OS's (Gingerbread and Honeycomb) Stock changes: Widgets relocated with apps -- apps button (top right home screen), Widgets tab Right click functionality changed -- see settings Apps stackable into nameable folders on home screen - drag one app onto another Data usage statistics/controls added to settings Stock browser has an option under the menu to "Request desktop site" which refreshes page with desktop version if possible Ability to access camera/camera apps added to lock screen Running/recent apps dismissed with a swipe left or right Tap once in Clock app to dim screen Ability to zoom in video recording mode of camera app added Effects mode added to video recording Panoramic picture taking added to still camera Settings icon changed (beware "hey, where'd it go!") Access Camera from Lock Screen (Swipe left for camera, right to unlock) Face Unlock with Blink to verify person is real* Panoramic Camera Mode Spell Check with error underlines built into the OS, works in most all apps (including browser, office apps, etc.) Tap red underlines for suggestions Create folders on the home screens by dragging and dropping an app on top of another. Name the folder as you wish. Google Now searching* Offline Voice Typing* Better predictive typing with the Android Keyboard* Revamped camera UI with easy access to photos and filmstrip views* Play Store Updates on downloads changed files (saves average of 66% of data downloads)* Dynamically resizing/moving widgets (widgets automatically make room for themselves on a home screen and resize if necessary)* New Fonts and languages* Stock web browser is Chrome* Notification changes: Tapping any notification now brings up all notifications (+control panel on Prime) An X below the notification panel will clear out all notifications Notifications no longer closed with an X, swipe left or right to dismiss Expandable notifications (get more info from each notification) with a pinch.* * - New since ICS Revised 5-Jul-2012 - Added Chrome and Nexus 7 Guidebook.