This is cool: Emulating a BBC Micro, Amstrad, Spectrum or Dick Smith VZ300 in a Java applet. Maybe I’ve been wrong in dissing Java.
Speaking of Beebs, apparently a version of cross-platform emulator BeebEm has been used to try to ressurect the 1980s BBC Domesday project. It makes interesting reading, particular with regards to the problems of digital preservation… not to mention the value of the resource in being a record of life in Britain from the time it was compiled.
How about cramming a modern small form factor motherboard into a BBC case?
http://www.mini-itx.com/2005/05/11/the-bbc-itx-b