I think one of the biggest hassles with instant messaging is that it’s tied to the computer. If I’m away from the computer, like watching tv, I may miss an important IM. I can leave the speakers on the PC really loud, but then I’m always jumping up and running back to the PC to read an incoming IM in case it’s important. Most of the time it’s not. I can subscribe to a service with my cell phone—but that (…)