List of helpful keyboard shortcuts for IntelliJ WebStorm 8 running on OSX
Alt+Up Select text blocks in incrementing size
Alt+Down Deselect text blocks in decreasing size
Shift+Shift Search Everywhere pop-up window
Shift-Cmd+F Search entire project (highlight text to autofill search query)
Shift-Alt+Click Create multiple carets
Cmd+D Duplicate current line or selection
Cmd+Delete Remove current line or selection
Shift+Enter Add new line without breaking current line
Cmd+Enter Add new line without moving caret
Alt+Tab Move cursor between documents in split view
Cmd+] Cycle backward to previous edit
Cmd+[ Cycle forward to next edit
fn+Up Jump up to next view in document
fn+Down Jump down to next view in document
Ctrl+G Highlight next instance of current selection (adds caret)
Cmd-Ctrl+G Highlight all instances of current selections (adds carets)
Shift-Ctrl+G Unselect previous highlight
Cmd-Alt+J Wrap selection in new tag (works mostly with HTML)
Shift-Ctrl+J Turn selection into single line
Cmd + / Comment with line comment
Cmd-Alt + / Comment with block comment