A few more handy ones:

Line Manipulation:

  Select Line (press again to select subsequent lines): Command+L / Ctrl+L
  Split multi-line selection into multiple selections, one per line:
    Command+Shift+L / Ctrl+Shift+L
  Delete to BOL: Command+Delete / Ctrl+Shift+Backspace
  Delete to EOL: Control+K / Ctrl+K,Ctrl+K or Ctrl+Shift+Delete
  Delete Line: Control+Shift+K / Ctrl+Shift+K
  Insert Newline After: Command+Return / Ctrl+Enter
  Insert Newline Before: Command+Shift+Return / Ctrl+Shift+Enter

Multiple Selections:

  Add next occurrence of current word to selection: Command+D / Ctrl+D
  Select all occurrences of current word: Control+Command+G / Alt+F3
  Undo through selection changes: Command+U / Ctrl+U