It's a bit like RISK, and it has some elements from Monopoly -- "Development cards" play the same function as the "Community Chest" cards, and the more you build on a certain area, the more resources you get to build with.
The board is unique -- it consists of small hexagonal pieces which must be rearranged for every game.
GIS: http://images.google.com/images?um=1&hl=en&newwindow=1&safe=off&rlz=1T4ADBF_enKR251KR252&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=the+settlers+of+catan&spell=1
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