From ChuckOp's Blog
One of my favorite keyboard shortcuts in Windows is CTRL+NUMPAD+Plus.
You can get Windows to automatically resize the columns (in details view) to fit the widest item for the column, so no data is lost and only the space needed is taken.
Geez... for how many years has this functionality just been sitting there unused? How the heck are people supposed to "discover" this kind of functionality? There's no menu item for this... no button... no help file I've ever seen that states this behavior...
What I would like to see, some magical day, is for microsoft to publish every single keyboard shortcut that exists in explorer and the built in windows controls.
And to make it easier to find the truly useful ones, make it so windows users can vote on their favorite ones. This shortcut would probably be in my top 10 most useful.