Anyway, here's the thing about Settlers: it came out in 1995.
That's right... Settlers came out over 15 years ago. It has changed very little in this time. It came out, won the Spiel des Jahres prize, and has rested upon its ever-increasing laurels since then.
While the basic game is fairly unchanged (the 2007 edition changes some cards and one rule), there are a host of expansions and spin-offs.
See here: List of Settlers of Catan products - Wikipedia, the free encyclopedia