Switching from Eclipse to IntelliJ IDEA was a great decision. Eclipse of course gets things done, but not as fast, not as flawless, not as intelligent as IntelliJ.
And yet, the switching process took me some time. Especially learning new shortcuts was a little bit irritating. Performing basic tasks took me minutes, because I had to look up the correct shortcut each time. It’s possible to use an Eclipse shortcut mapping, but since I wasn’t going to switch back, I’ve decided to learn the default mapping. JetBrains offers a nice overview (PDF) containing most important shortcuts. In order to find the correct row faster, I have added another column with Eclipse shortcuts.

So let’s say I want to see a class outline. I know it’s Ctrl + O in Eclipse. Now I just have to look for this shortcut in the first column to find the IntelliJ equivalent. For a shortcut junkie like me this is a lot faster than reading the action descriptions. I hope this helps other software developers, too.
Let me know if any shortcut mapping is wrong or missing.

Update 17.10.2015
A friend of mine wrote a script to make the search more interactive. Check it out!


EclipseIntelliJ IDEAAction
Editing
Ctrl + SpaceCtrl + SpaceBasic code completion (the name of any class, method or variable)
Ctrl + Shift + SpaceSmart code completion (filters the list of methods and variables by expected type)
Ctrl + Shift + SpaceCtrl + PParameter info (within method call arguments)
F2Ctrl + QQuick documentation lookup
Ctrl + mouse overBrief Info
F2Ctrl + F1Show descriptions of error or warning at caret
Alt + InsertGenerate code... (Getters, Setters, Constructors, hashCode/equals, toString)
Ctrl + OOverride methods
Ctrl + IImplement methods
Ctrl + Alt + TSurround with... (if..else, try..catch, for, synchronized...)
Ctrl + Shift + DeleteUnwrap/Remove statement
Ctrl + Shift + CCtrl + Shift + YComment/uncomment with line comment
Ctrl + Shift + /Ctrl + Alt + Shift + YComment/uncomment with block comment
Alt + Shift + UpCtrl + WSelect successively increasing code blocks
Alt + Shift + DownCtrl + Shift + WDecrease current selection to previous state
Alt + QContext info
Ctrl + 1Alt + EnterShow intention actions and quick-fixes
Ctrl + Shift + EnterComplete current statement
Ctrl + Shift + FCtrl + Alt + LReformat code
Ctrl + Shift + OCtrl + Alt + OOptimize imports
Ctrl + Shift + VPaste from recent buffers...
Ctrl + Alt + UpCtrl + DDuplicate current line or selected block
Ctrl + DCtrl + YDelete line at caret
Shift + EnterShift + EnterStart new line
Ctrl + Shift + X/YCtrl + Shift + UToggle case for word at caret or selected block
Ctrl + DeleteCtrl + DeleteDelete to word end
Ctrl + BackspaceDelete to word start
Ctrl + NumPad+/-Ctrl + NumPad+/-Expand/collapse code block
Ctrl + NumPad *Ctrl + Shift + NumPad+Expand all
Ctrl + Shift + NumPad /Ctrl + Shift + NumPad-Collapse all
Ctrl + WCtrl + F4Close active editor tab
Alt + Up/DownCtrl + Shift + Up/DownMove line up/down
Ctrl + Up/DownScroll Line up/down
Search/Replace
Ctrl + FCtrl + FFind
Ctrl + KF3Find next
Ctrl + Shift + KShift + F3Find previous
Ctrl + FCtrl + RReplace
Strg + HCtrl + Shift + FFind in path
Ctrl + Shift + RReplace in path
Usage Search
Ctrl + GAlt + F7Find usages
Ctrl + Shift + GCtrl + F7Find usages in file
Ctrl + Shift + F7Highlight usages in file
Ctrl + Alt + F7Show usages
Ctrl + Shift + UShow occurrences in file
Compile and Run
Ctrl + BCtrl + F9Make project (compile modifed and dependent)
Ctrl + Shift + F9Compile selected file, package or module
Alt + Shift + F10Select configuration and run
Alt + Shift + F9Select configuration and debug
Ctrl + F11Shift + F10Run
Shift + F9Debug
Debugging
F6F8Step over
F5F7Step into
Shift + F7Smart step into
F7Shift + F8Step out
Ctrl + RAlt + F9Run to cursor
Ctrl + UAlt + F8Evaluate expression
F8F9Resume program
Ctrl + Shift + BCtrl + F8Toggle breakpoint
Alt + Shift + Q, BCtrl + Shift + F8View breakpoints
Navigation
Ctrl + Shift + TCtrl + NGo to class
Ctrl + Shift + RCtrl + Shift + NGo to file
Ctrl + Alt + Shift + NGo to symbol
Ctrl (+ Shift) + TabAlt + Right/LeftGo to next/previous editor tab
Ctrl + LCtrl + GGo to line
Ctrl + ECtrl + ERecent files popup
Ctrl + Shift + ERecent edited files popup
Alt + Left/RightCtrl + Alt + Left/RightNavigate back/forward
Ctrl + Shift + BackspaceNavigate to last edit location
F3 or Ctrl + ClickCtrl + B or Ctrl + ClickGo to declaration
Ctrl + TCtrl + Alt + BGo to implementation(s)
Ctrl + UGo to super-method/super-class
Ctrl + Shift + Up/DownAlt + Up/DownGo to previous/next method
Ctrl + Shift + PCtrl + >/<Move to code block end/start
Ctrl + OCtrl + F12File structure popup
F4Ctrl + HType hierarchy
Ctrl + Shift + HMethod hierarchy
Ctrl + Alt + HCtrl + Alt + HCall hierarchy
Ctrl + . / Ctrl + ,F2 / Shift + F2Next/previous highlighted error
Alt + Shift + BAlt + HomeShow navigation bar
Ctrl + Shift + TNavigate from/to the corresponding test class, or create one
Bookmarks
F11Toggle bookmark
Ctrl + F11Toggle bookmark with mnemonic
Ctrl + #[0-9]Go to numbered bookmark
Shift + F11Show bookmarks
Refactoring
F5Copy
F6Move
Alt + Shift + RShift + F6Rename
Alt + Shift + CCtrl + F6Change Signature
Alt + Shift + ICtrl + Alt + NInline
Alt + Shift + MCtrl + Alt + MExtract Method
Ctrl + 2, LCtrl + Alt + VExtract Variable
Ctrl + 2, FCtrl + Alt + FExtract Field
Ctrl + Alt + CExtract Constant
Ctrl + Alt + PExtract Parameter
Version Control
Ctrl + #Ctrl + KCommit
Ctrl + Shift + KPush
Ctrl + TUpdate project
Ctrl + Alt + ZRevert changes
Ctrl + Alt + Shift + DownNext Change
Ctrl + Alt + Shift + UpPrevious Change
Live Templates
Ctrl + Alt + JSurround with Live Template
Ctrl + JInsert Live Template
General
Ctrl + MCtrl + Shift + F12Toggle maximizing editor
Alt + Shift + FAdd to Favorites
Alt + Shift + IInspect current file with current profile
Ctrl + Alt + SOpen Settings dialog
Ctrl + Alt + Shift + SOpen Project Structure dialog
Ctrl + 3Ctrl + Shift + AFind Action
Ctrl + TabSwitch between tabs and tool window
Ctrl + Shift + CCopy Path