There are various websites dedicated to histories and resources related to the BBC Micro including:
Stairwaytohell (discontinued as of April 2010)
StarDot - community site
Chris’s Acorns – about all Acorn computers
Other resources also worth listening to or reading are the British Library’s Oral History of British Science project, including oral history interviews with Steve Furber and Andy Hopper.
Steve Furber Oral History
Andy Hopper Oral History
BeebEm is BBC Micro emulator (versions for use of Windows, Mac and Linux Operating Systems amongst others). More information at: http://www.mkw.me.uk/beebem/