On EnglishRussia (and apparently ganked from a possibly defunct LiveJournal -- It looks like LJ had an outage earlier today), a wonderful detailed HOWTO for making the tiniest, most adorable kitchen knife you ever did see.
A kitchen knife may become an end in any argument… This knife is made on a scale of 1 to 12 from flat stained steel sheet 1.5 mm thick. Other elements are made of plastic and the clinchers are from aluminium wire 0.6 mm in diameter.The needed tools: a vise, 2 files, 3 broach files, abrasive paper of two types, a drill fixed on a vertical support – 1 set, a drill bit 0.6 mm, a piece of thick felt for polishing the handle, an extra wooden bar.
I love my Leatherman, and I would carry it in my pocket all the time if it didn't feel like a lead brick was trying to pants me every time I took a step. Given that gravity is, in most situations, unavoidable, I have been searching for a slim, lightweight knife I could keep in my pocket on an everyday basis.
The 22g and 34g (their weight in grams) are minimalist folding knives. Like the previously reviewed lighter but still too-heavy Leatherman Skeletool, the Baladeos have skeletonized handles that leave just enough material to provide protection when the blade is closed. The blade itself has only a single edge so that it lays flat against the steel to prevent any accidental cuts when grabbing it in your pocket. The handle itself is designed with a surprisingly sturdy lock that I have found safe and easy to use. The only downside to the handle's design is that if you put too much pressure (read: significantly more than is required for most day-to-day activities) the lock can sometimes slip, causing the knife to unlock and shift which can be dangerous. It only happened once during my artificial tests, and when it did the blade stayed far away from my fingers.
This handy gentleman has built an (arguably ill-conceived, but nevertheless impressive) rifle-cum-slingshot that fires machetes, should you find yourself with the need to fire machetes. He also has a sideline in selling parts for making your own insane slingshot-like inventions.