I've mentioned the game "Caylus", which is our current favorite. We had somehow messed up one of the rules - at the start of each turn, we were distributing 3 coins o each player, but the actual rule is 2. It seems like a small change, but it really affected play on Friday night. Suddenly, a bunch of buildings that hadn't seemed relevant to us (ones that deal with money rather than goods) got played - and consequently, there were far fewer resources available. I don't know if that style of play will stick with our group, but it certainly shook things up.