I'm a big fan of the SOG Seal Pup...I carried that for a year or so in the army, before I got hurt. I sold it to a friend going overseas right before I got discharged. Fantastic knife. Holds a razor edge for a long time, is extremely strong, reasonably lightweight, and well balanced. All in all, everything I'm looking for in a fixed-blade knife.
My all-time top knife-like object is a Leatherman PST-II. Compact, lightweight, durable, and fantastically useful. If I were to be stuck on a desert island with only a single knife/tool, this would be it. Given sufficient time, I could build a house with it. Remember: When you have a Leatherman, everything becomes Leathermanipulable!