Whatever Happened To The Thin X11 Terminals?

GregK asks: "Once upon a time (in the fun, fast 80's), you could find a different kind of X-box, a thin client that ran X!! and did little local processing. These boxes had a monitor, keyboard, and a thin box of electronics to communicate on an ethernet port and run an X11 server locally. Whatever happened to this kind of thing? I ask because I'm interested in putting a thin client in my bedroom, and leave my Linux server in the basement. A wireless connection could send the data over the two floors, and in an ideal world I'd have a color LCD monitor (24 bit or more) connected to a wireless transceiver. The monitor would not have a fan or a hard drive, but would be able to run X11. This would let me have an always-on connection without an always-loud presence in my bedroom. Now the best I can come up with is a modified, old laptop with the hard drive ripped out, and a boot disk/CD-R combination that would let the CPU boot and read the X software into memory. But there has to be better! Can anyone help?"