Leopard Tips and Tricks: “The columns in the Open & Save dialogues never seem to be the right size, so how do you do something about it?
- Well, if you double click the little symbol with two vertical lines
at the bottom of the columns in an Open/Save dialogue box, then it will
fit that columns items into the view so you can see file names in their
entirety. - If you hold down the option key when you do that it will do it to every column you see.
- And finally, control-clicking or right-clicking brings up this little choice of things to do to the views:

Good tip. I knew I could click and slide the column to change the width, but your hints are nicer. Is there anyway to make the column-width change permanent?