Saw this at a store the other night. I thought it was a great idea. The main pic is bit misleading as the rods sit flush in the block. It was cheaper than in the link too, but the link has some OK pics.
http://www.firststreetonline.com/pro...37437&id=34836
The knife block is made up of lots of thin long plastic rods in a base. You can put any knife any where you want upright, horizontal at angles and all. If the block gets gunky, the rod insert is diswashwer safe. The knives do not drift through the material under their own wieght, although I didn't get to try a full 10 inch chef's knife in an otherwise empty block. But it should still work.
So many blocks are made for just a specific type of knife, but this will fit any selection of tall and short knives.
Phil