What are people actually doing with tiny pcs that require much computing power? I use one to serve a dashboard on a monitor at work, but haven't done anything else with them.
I use mine as a VPN gateway, web cache, media streamer, and source code repository. Sometimes I even use it as a pleasantly-silent desktop, since it's on the same stand that holds my monitor and keyboard/mouse. Because it's right here in the house, latency and bandwidth are great. Because it consumes so little power (even with an external 2.5" disk drive attached) I don't worry about leaving it on all the time. It's just a good do-everything workhorse, that also happens to be small enough that I could toss it in a bag and take it on the road with me if I felt like it.
HTPC has been the most common use I've seen. I use my Raspberry Pi to run XBMC. It gets the job done although the menu can be a little sluggish; I've been thinking of upgrading it for awhile.
Just a regular B, actually. I bought it before the B+. The B especially is something of a struggle with its two sole USB ports. I use one for the wifi adapter, and the other to plug in my external hard-drive. I have to control the program entirely via my phone, since I can't plug in a keyboard or an IR adapter.
I don't mind the odroid, but I would love it a lot more if there were some official Debian images for it. The software side of things is lacking a little bit.
