Thomas Haigh published an excellent introduction to computing history URL some years ago. It addresses a large number of relevant aspects of computer and computing history, including the practice of historians work (compared to that of computer scientists), relevant sources, snippets of the history of the history of computing, different kinds of history areas, etc.
As the paper appears in an edited volume on using history in the teaching of computer science, the paper also carries a section on this relevant topic.
As to user interfaces, the paper carries nothing of particular interest. But user interface history is emebedded in the history of computing, this topic is very valuable.
References
Haigh, Thomas (2004): The History of Computing: An Introduction for the Computer scientist. In: Aspray, W. and Atsushi, A. (2004): (eds): Using History to teach Computer Science and related disciplines. Washington DC: Computing Research Association, 5-26.
Akera, Atsushi and Aspray, William (2004) (eds): Using history to teach computer science and related disciplines. Computing Research Association, Washington.
The whole volume can be downloaded in Pdf (note 1.7 MB, 309 pages)
