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Having said all that, the NSLU2 really comes close to what I'm looking for. So, anyone know of something like that in a single box?

You can use Lacie Biggerdisk gear to get your two drive boxes down to one. (Assuming the NSLU2 deals with >128G disks, but if it doesn't you're in trouble either way.) And it wouldn't surprise me if there were next to no electronics in an NSLU2, and you could mount it inside the Biggerdisk somehow. Failing that, of course you don't have to carry the NSLU2 with you to work for initial loading, only the Biggerdisk.

Otherwise, I'd say get a VIA mini-PC (http://www.mini-itx.com), underclock it (I have a Pentium 200 that's way overpowered as a Rio Receiver server), and think about getting Sonos boxes (http://www.sonos.com) -- if their PC-side software lives up to its online demo, it's the best I've seen in this game. In particular, it's the only one I've seen that lets you collect clients into synchronised zones and do proper running-order editing on each zone from a central location. Plus it'll allegedly do other neato stuff, like stream any client's line-input out of any other client's output. The only issue with Sonos is that it's not UPnP -- if you want UPnP, the easiest way is to put Windows XP on your server (probably not then underclocking it), and Windows Media Connect, and get Netgear MP101s as the clients.

Peter