Bridle and I are going to be moving out in a few months and for the new place I want to have some sort of way of getting my old non-networked machines online, so I kinda decided to make a dial-in service at home so a machine with at least a serial port will be able to connect up to our local network and the internet.
But then I was also thinking about stuff like PBXes and voip and I don't know now, haha. At lot of that stuff is like magic to me.