Pocket Knife Sharpener
This pocket knife sharpener re-sharpens about any blade you've got in just 3 to 4 strokes. I wish I could use it on other stuff I've got that's dulled. Like, say, my brain.
The sharpener stuffs a 2-step system into its palm-sized frame. For dull blades, use the pair of tungsten carbide blades with pre-set angles to get your edge back. Then run the knife through the sharpener's 2 crossed ceramic rods, also with pre-set angles, to achieve a smooth finish.
The sharpener has a non-skid base to hold it in place and help prevent inadvertent hand and finger tests of how dull that blade really is during use. For hunters and fishermen, the sharpener works particularly well on fillet knives.