I have an Emac and I'm thinking of getting something for wireless. An Airport card costs $50, but I don't want to put more money into this old computer. Is there something I could get that would plug into a USB port or something, that would work as well? That way I could use it with another computer. (Or do they all have wireless now? Maybe I could use it with my Tivo later?) My house is undergoing renovation and I was thinking of putting some cable in the walls, but I think it might not be worth it now that wireless is so common. How fast are wireless connections compared to an Ethernet cable, and are they generally reliable throughout an average house?