Cut C-w
Copy M-w
Paste C-y
Kill Word M-d
Selecting and copying words or sexps without moving the cursor (c.f. http://emacswiki.org/emacs/CopyWithoutSelection)
C-M-SPC M-w
Kill rest of line or one or more lines (kill-line)
C-k
Create/switch buffers C-x b
Kill buffer C-x k
Kill the text of the region-rectangle, saving its contents as the "last killed rectangle" (kill-rectangle)
C-x r k
Yank the last killed rectangle with its upper left corner at point (yank-rectangle)
C-x r y