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-age: 24
-country of residence: USofA
-occupation: Navy
-sex: Male
1. Sometimes
a) It's part of a leatherman-type multi-tool. It's useful for cutting line, plastic, fabric, wire, cord, opening boxes, etc.
2. Errr... it's not really the primary function of the tool, so the knife is pretty much crap.
3. Serrated edges are really useful for cutting plastic sheeting, it seems to guide the plastic and keep it at the proper angle to cut through with one smooth slash... also useful for sawing through thicker types of rope. This is mainly from borrowing other people's knives. Mine is just a simple smooth blade, so the material will often slide to one or the other end of the blade and stop being cut. One handed opening and closing, with lockblade, are pretty much a necessity. A way to attach it to a belt for easy accessiblity is nice. All metal construction is durable, but can be hard to get a good grip on when your hands are wet or covered in oil... shaping the frame for positive grip or replacable rubber/plastic/wood inserts would be groovy.

Oh, and it should still look good when it's all scratched to hell and still work when it's covered in crap.

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Simple Machines in Higher Dimensions