Summary of all the shortcuts in this thread and some more.
Ctrl + Tab - Switch between source and header files.
Ctrl + Shift + T - Open Element
Ctrl + Shift + R - Open File/Resource.
Ctrl + = - Explore Macro Expansion.
Ctrl + Space - Show proposals to complete you've written.
Ctrl + Alt + H - Opens the call hierarchy for a function
Ctrl + Shift + N - Adds an #include for the header file in which the current element is declared
Ctrl + i - Corrects indentation of the selected text - very useful in my opinion
Ctrl + d - Deletes current row
Ctrl + h - Opens a search dialog; the "C/C++ Search" tab searches through indexed locations
Ctrl + O - Opens a member browser of the current class, enabling to fastly open a method
F3 - Open declaration
Ctrl + Shift + G - When a function, object or var is selected : find all occurences of it in the project.
Ctrl + Alt + G - Textual search of the currently selected text.
Ctrl + left click - Go to the definition of the item.
Ctrl + j - Incremental search in the current file
Ctrl + k - To search forward for a highlighted text in a file.
Ctrl + Shift + k - To search backward for a highlighted text in a file
Alt + ←/→ - Go to previous / go to next edited or viewed place.
Ctrl + m - Maximize or un-maximize current Editor Window (also works for other Windows
Ctrl + Shift + Up/Down Arrow - Jump to previous / jump to next method
Ctrl + q - Jump to last location edited
Ctrl + Shift + p - With a bracket selected: jump to the matching closing or opening bracket
Ctrl + / - Comment/uncomment all selected lines with //
Ctrl + Shift + / - Comment selected block with /* ... */
Ctrl + Shift + \ - Uncomment /* ... */ selected block