Tip:Delete/Copy Column in TextEdit or Mail App August 23, 2007
Posted by asimag in MacBook Pro.trackback
Sometimes you want to delete a column in TextEdit or to copy a Column from Mail instead of rows. You can do this in Mac quite easily, just hold down the OPTION key (Located left of APPLE key) while making a selection. I was looking for this quite a sometime. It saved me lots of keystrokes.

Thank you for this hint. It saved me a lot of time.
Also:
To add a row: place insertion point in a cell, then option-enter.
To del a row: select a few cells in a row, then option-delete