Cold Steel Super Edge
The most useful knife is the one you have on you. Clip this little guy to your key ring (or string it around your neck) and I guarantee that you will use it more than any other knife you own. I've got one on mine and use it every day. Because it is a fixed-blade rather than a folder, and because it is constructed with many of the design elements and materials (high carbon stainless steel and Kraton) that Cold Steel uses in their larger knives, this 2" serrated blade cuts all out of proportion to its size.
Made in Taiwan.