Often times when delivering a training class, while browsing around in Explorer, I will hit a particular keystroke which almost always elicits conversation from my students who are paying close attention... I am not sure why, but it appears to be a little known keyboard shortcut that I use quite often that is the center of the conversation.

Consider the following example of a listview which contains items that we really want to see, but the shell doesn't want us to see completely for some reason:

From here, all we can tell is there are two files that currently look exactly alike.  Bummer.

Now for the coolness.  While holding the CTRL key down, press the + sign on the numpad (or for you laptop users, the numpad equivalent of CTRL + Fn + / ).

As you can see, *all* columns are appropriately sized in one swift keyboard move.

Another one of my favorite morsels as a lefty is CTRL+INSERT for Copy and SHIFT+INSERT for Paste.  No need to remove your left hand from that mouse...except in the Outlook reading pane...ugh.