xcode

Navigation:

Quick open:                        Shift + Cmd + o 
Jump to next error:                Cmd + '
Switch between .h/.m               Ctrl + Cmd + ,
Jump to file definitions           Ctrl + 6

Building:

Build and run                      Cmd + r
Clean                              Shift + Cmd + k

Panels:

Toggle Debug panel:                Shift + Cmd + y
Toggle Navigation panel:           Cmd + 0
Open Assistent panel:              Cmd + Option + Enter 
Close Assistent panel:             Cmd + Enter

Mouse:

Go to definition:                  Cmd + Click
Help:                              Option + DoubleClick

Selection:

Help:                              Ctrl + Option + Cmd + ?

Text editing:

Indent:                            Cmd + ]
Un-Indent:                         Cmd + [

Debugging:

Clear console:                     Cmd + k
Toggle all breakpoints             Cmd + y
Add/remove breakpoint at cursor    Cmd + \