Who is using one? I have been thinking about investing in one. I already have several spare hard drives sitting around (around 1TB total) so that's not an issue. I'm fairly new to these, so any input would be great. I mostly want it to just be a place to store music/movies/photos so Liz and I can access it from wherever we want, and also get stuff on the TV via PS3. I've read that some are setup to stream iTunes audio as well. Is this worthwhile? Other than that, things to look for / avoid?