The efficient functionality of things Scandianavian is evident. This means you don't need a lot of equipment to keep your knife sharp. All you need is a flat abrasive surface. Some surfaces are more efficient, or handier, than others, so here are a few suggestions. Diamond Plates Diamond plates are the top of the line for easy maintance of a good edge.
Diamond plates are steel plates with abrasive diamond grit bonded to the surface.
They cut quickly, but leave a relatively smooth surface. They can be used dry, or with water, rather than messy oil. Best of all they stay flat, and do not wear into the saddle shape typical of old sharpening stones. Since even industrial grade diamond is expensive, diamond plates cost more than most stones. They're worth it.