I just got a macbook pro, and i'm curious what to do with the ExpressCard/34 slot. seems like i should get some use out of it. -apple mentions a cellular 3g card but i'm not into any more monthly data fees. - i found out about an hd tv tuner that can use it. - and i pretty sure i can expand ports with it. (would they be just as fast as the built in ports?) SO... what do you guys do with it?