Fun Tabletop Games?

Mr. Ghost asks: "My friends and I have recently been in the market for a good new boardgame or other tabletop game. We have worked through the gamut of games like Axis & Allies, Supremacy, and War! Age of Imperialism. More recently we have been playing tile based games like Carcasonne and Settlers of Catan. I am looking for some suggestions on some new games we could get into."