Are there any PC Cards (I think that's what they were called) that allow you to get online when out of wifi range, when traveling etc.? Or I think I'd heard about a way you can connect your macbook to your iphone, and piggyback the connection that way, I think called a Leash perhaps? I'm travelling to my in-laws, who don't have wifi and we're trying to figure out how to get online there with our macbooks. thanks!